20" Inch Quad MPK Poll: 60 mph and 60°F

[MoreTrout]

No such thing as 10 miles of flat road in PA. But I do about a 190 mile drive each way anywhere from 1 to 3 times a month between home and camp on my 20 in OEM Pirellis. About 20 miles of it has a speed limit of 65 mph, and the rest is 55 mph or under. I typically drive ~5-7 mph over speed limit. In 60 deg temps I'll get 2.25-2.45 mpk all day long in AP on that trip. This year I started towing my EGO zero turn mower on a small ramp trailer and got 1.75-2.1 mpk while towing. With over 2k miles of towing this summer I think the avg was around 1.9 mpk.

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[DayTripping]

I did a run today, 59 mph avg, crosswind but mostly on the 45 degree angle on the nose of 7 mph gusting to 14. I was in AP and had forgotten I was in Standard ride height until after the run. My first part of the run was uphill gaining about 100'. I have to say it was almost hot enough for the AC but I ran without it so we can have numbers we can compare.

For my overall run on the highway, I was at 2.9 mpk in AP mode. For the flatter part of my run with no major gains or losses in altitude, I was at 3.12. I set the cruise control at 61 mph.

I am rolling on Goodyear Territory AT 275/60/20 and my R1T is a 2023 AE.

Below it all is a screenshot from Electrafi. That was the door to door run for my trip. Below that is the mostly the return trip but starting about 1/3 of the way home. As luck would have it, the winds shifted about 110 degrees and I ended up with a headwind almost dead on the nose and it was stronger than the crosswind going up. I also drove a bit faster yet the overall efficiency was still almost 3 mpk.

I am pretty happy with the Goodyears, especially since nobody considers them an "efficient" tire. Now that the temps are warmer (and the tires broken in) and I can have a better comparison, they are at least as efficient as my 21" factory tires were. Very pleased with these tires so far. While I've said I wasn't super concerned about efficiency when I bought these, it was still a consideration.

At 60 mph, taking my 2.9 mpk, that gives me a range of 377 miles with my large pack. At the 3.12 mpk, I am at 405 mile. This was in AP mode and not conserve so pretty solid results. Who needs a max pack? Just slow down. Thanks again to @B Digs for being honest with his personal experience while trying to eliminate any bias as a designer of these tires. Great work Brian!

It was agonizing though, to drive my truck this slow for so long. Almost nobody drives anywhere near that slow on the freeways here.

We definitely need to raise the mpk ranges for the initial poll.

 

[B Digs]

...Thanks again to @B Digs for being honest with his personal experience while trying to eliminate any bias as a designer of these tires. Great work Brian!...

Thanks @DayTripping for another great report and the kind words!

 

[ksurfier]

I did a run today, 59 mph avg, crosswind but mostly on the 45 degree angle on the nose of 7 mph gusting to 14. I was in AP and had forgotten I was in Standard ride height until after the run. My first part of the run was uphill gaining about 100'. I have to say it was almost hot enough for the AC but I ran without it so we can have numbers we can compare.

For my overall run on the highway, I was at 2.9 mpk in AP mode. For the flatter part of my run with no major gains or losses in altitude, I was at 3.12. I set the cruise control at 61 mph.

I am rolling on Goodyear Territory AT 275/60/20 and my R1T is a 2023 AE.

Below it all is a screenshot from Electrafi. That was the door to door run for my trip. Below that is the mostly the return trip but starting about 1/3 of the way home. As luck would have it, the winds shifted about 110 degrees and I ended up with a headwind almost dead on the nose and it was stronger than the crosswind going up. I also drove a bit faster yet the overall efficiency was still almost 3 mpk.

I am pretty happy with the Goodyears, especially since nobody considers them an "efficient" tire. Now that the temps are warmer (and the tires broken in) and I can have a better comparison, they are at least as efficient as my 21" factory tires were. Very pleased with these tires so far. While I've said I wasn't super concerned about efficiency when I bought these, it was still a consideration.

At 60 mph, taking my 2.9 mpk, that gives me a range of 377 miles with my large pack. At the 3.12 mpk, I am at 405 mile. This was in AP mode and not conserve so pretty solid results. Who needs a max pack? Just slow down. Thanks again to @B Digs for being honest with his personal experience while trying to eliminate any bias as a designer of these tires. Great work Brian!

It was agonizing though, to drive my truck this slow for so long. Almost nobody drives anywhere near that slow on the freeways here.

We definitely need to raise the mpk ranges for the initial poll.

Adjusted for temp/elevation that works out to 2.6 to 2.7, both are options for the poll

 

[DayTripping]

Where are the conversion tables? I am about 500' MSL.

Are you doing a conversion factoring in density altitude or what?

If others aren't providing the additional info I typically do, it will be impossible to do an accurate comparison.
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If correcting for that, then should also factor in the headwind component of my crosswind. Which would be at least 5 mph gusting to 10.

 

[ksurfier]

Where are the conversion tables? I am about 500' MSL.

Are you doing a conversion factoring in density altitude or what?

If others aren't providing the additional info I typically do, it will be impossible to do an accurate comparison.
-----------------
If correcting for that, then should also factor in the headwind component of my crosswind. Which would be at least 5 mph gusting to 10.

Adjust MPK up/down 0.1 for every 7°F
For elevation 0.03 MPK per 500 feet.
2.9 minus 0.3 minus 0.03 = 2.57 MPK

 

[DayTripping]

Then you need to add a correction factor for the headwind.

At the end of the day, my Goodyears are more efficient than my 21" Pirellis were and far more than my 20" factory ATs.

Following your approach, it would be 2.57 to 2.79. The higher number is on the flatter section with fewer elevation changes and a more neutral overall elevation change.

For reference, here is my return run on the flatter section. I did have higher speeds at times than the run up. I also have the wind data which was a 9 mph headwind pretty much on the nose. I tried to screenshot the gusts it capture. The winds were gusty for most of my drive. They were gusting to at least 15 and sometimes higher.

Anyway, pretty solid results no matter how you look at it. It probably would have been solidly in the 3's with conserve mode. Also better if I ran it in low mode rather than standard. I almost never use AP. It is either sport or conserve.

 

[ksurfier]

Then you need to add a correction factor for the headwind.

At the end of the day, my Goodyears are more efficient than my 21" Pirellis were and far more than my 20" factory ATs.

Following your approach, it would be 2.57 to 2.79. The higher number is on the flatter section with fewer elevation changes and a more neutral overall elevation change.

For reference, here is my return run on the flatter section. I did have higher speeds at times than the run up. I also have the wind data which was a 9 mph headwind pretty much on the nose. I tried to screenshot the gusts it capture. The winds were gusty for most of my drive. They were gusting to at least 15 and sometimes higher.

Anyway, pretty solid results no matter how you look at it. It probably would have been solidly in the 3's with conserve mode. Also better if I ran it in low mode rather than standard. I almost never use AP. It is either sport or conserve.

Try again tomorrow at 8:30-9:00, will be better temps and conditions…(or between 8 am to 10 am on Saturday)

 

[DayTripping]

Impossible here at that time where I live. Traffic is too bad and almost impossible to maintain a constant speed. It is similar to driving on the 5 or the 405 in SoCal. I was pretty lucky that I could go 10 miles or more today at the times I did without having to brake or drop well below 50.

 

[opnwide]

1.94 on my 67lb Mickey Thompson Baja Boss 20’s…2.14 on the “bantam weight” OEM Pirelli’s….Mickey LT’s been worth every drop in efficiency…could care less at the top of a 12,000 ft rocky pass.

 

[ksurfier]

1.94 on my 67lb Mickey Thompson Baja Boss 20’s…2.14 on the “bantam weight” OEM Pirelli’s….Mickey LT’s been worth every drop in efficiency…could care less at the top of a 12,000 ft rocky pass.

10% less MPK is very minor for those monsters…

 

[DayTripping]

I found some time and fortunately decent traffic. Here are the runs from today. It was 60 degrees out (actually started colder). I was in AP mode for the first 2 runs. First was out on a fairly level section and then I turned around and came back.

The 3rd one is just running it in conserve mode a fairly flat section on my return towards home but then it ends uphill. My first 2 runs were with a 4mph crosswind gusting to 9 and the last one in conserve was 3-4 mph gusting to 6. My conserve mode run was at 3.66 mpk until the hill knocked it down to what you see. While editing this, I decided to add it for reference.

This is probably the first time in weeks I wasn't dealing with a headwind on my runs. I don't know why the trip computer has the avg speed wrong. I set the cruise at 61 mph. I verified by my GPS that it was between 59.8 to 60.0 when set at 61 and some times I was up to 62. No place did I have to slow down. When the trip computer would first start tracking, it would show my speed at some random number less than my actual speed and slow almost catch up after a few miles.

@ksurfier - I still think you need to raise the poll numbers. The results today show that yesterdays runs were no fluke, especially since I had a headwind. I didn't have enough time to get to where it is generally flatter but I think if I could have, the numbers would have settled pretty close to 3.0 mpk as they were trending up when I finally had to turn around. These are solidly 2.96 if you average them out. So even accounting for altitude, they are solidly over 2.9. Who needs a Gen2 for efficiency?

I didn't buy these tires for efficiency; however, they have done surprisingly well in this department.

 

[ksurfier]

I found some time and fortunately decent traffic. Here are the runs from today. It was 60 degrees out (actually started colder). I was in AP mode for the first 2 runs. First was out on a fairly level section and then I turned around and came back.

The 3rd one is just running it in conserve mode a fairly flat section on my return towards home but then it ends uphill. My first 2 runs were with a 4mph crosswind gusting to 9 and the last one in conserve was 3-4 mph gusting to 6. My conserve mode run was at 3.66 mpk until the hill knocked it down to what you see. While editing this, I decided to add it for reference.

This is probably the first time in weeks I wasn't dealing with a headwind on my runs. I don't know why the trip computer has the avg speed wrong. I set the cruise at 61 mph. I verified by my GPS that it was between 59.8 to 60.0 when set at 61 and some times I was up to 62. No place did I have to slow down. When the trip computer would first start tracking, it would show my speed at some random number less than my actual speed and slow almost catch up after a few miles.

@ksurfier - I still think you need to raise the poll numbers. The results today show that yesterdays runs were no fluke, especially since I had a headwind. I didn't have enough time to get to where it is generally flatter but I think if I could have, the numbers would have settled pretty close to 3.0 mpk as they were trending up when I finally had to turn around. These are solidly 2.96 if you average them out. So even accounting for altitude, they are solidly over 2.9. Who needs a Gen2 for efficiency?

I didn't buy these tires for efficiency; however, they have done surprisingly well in this department.

That looks very promising…
Any guess what contribution the lighter rims are having?

 

[DayTripping]

That looks very promising…
Any guess what contribution the lighter rims are having?

While I think there is some benefit to them, I think it is far less on the highway than around town where I am accelerating a lot more. These are not the most aerodynamic or lightest of all Atomic Wheels. I think I saw a YT vid where someone was trying to quantify the impact of the wheels on their config. It was for their lightest and most aerodynamic wheel.

I think their testing was about a 2% improvement on the highway and almost 4% around town. I could believe that. Their wheels were another 2 pounds lighter than mine but they were also running a mild all season tire with them. It was also on a PDM I think which is likely more efficient than my quad.

I have about 1200 miles on the Goodyears so far and no issues with noise, handling, vibration, ride comfort or any things that were my top priorities in choosing a tire. The efficiency is just icing on the cake. Since they are so efficient at lower speeds, I may slow down more often and take advantage of it. I may have a chance to do some 70 and 80 mph runs over the next week if traffic isn't too bad. It will be cool to cold and be an interesting test. At this point I'll absolutely buy another set if I can get at least 25k miles out of them the way I typically drive.

 

[ksurfier]

While I think there is some benefit to them, I think it is far less on the highway than around town where I am accelerating a lot more. These are not the most aerodynamic or lightest of all Atomic Wheels. I think I saw a YT vid where someone was trying to quantify the impact of the wheels on their config. It was for their lightest and most aerodynamic wheel.

I think their testing was about a 2% improvement on the highway and almost 4% around town. I could believe that. Their wheels were another 2 pounds lighter than mine but they were also running a mild all season tire with them. It was also on a PDM I think which is likely more efficient than my quad.

I have about 1200 miles on the Goodyears so far and no issues with noise, handling, vibration, ride comfort or any things that were my top priorities in choosing a tire. The efficiency is just icing on the cake. Since they are so efficient at lower speeds, I may slow down more often and take advantage of it. I may have a chance to do some 70 and 80 mph runs over the next week if traffic isn't too bad. It will be cool to cold and be an interesting test. At this point I'll absolutely buy another set if I can get at least 25k miles out of them the way I typically drive.

here is my best guess for your setup:
20” OEMs: 2.25 MPK
20” Goodyears with AW01:
Total MPK: 2.8
(Increase from tires: 0.3 MPK)
(Increase from rims: 0.25 MPK)
Weight reduction: 7-8 lbs from tires
14.5 from rims
While it may be a little bit more efficient it’s hard to tell from your tests so far. If someone can test Goodyears with OEM rims that will give us a good idea how much the rims are influencing the MPK gain…

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