20" Inch New Tire: GoodYear ElectricDrive AT

[UnsungZero_OldTimeAdMan]

Can anyone who has these tires share their efficiency (regardless of how far you've driven)? I just installed these tires on my Gen1 quad R1S and I'm shocked at what I'm seeing very early on. Over 30k miles on the 20 inch scorpions I averaged 2.07 m/kwh. I was expecting these tires to be about the same efficiency, and hoped that they would be slightly higher since they are more road oriented with slight AT. However over my first 30 miles driving them I'm getting 1.37 m/kwh!! I have been driving normal and the efficiency graph driving around normal places is just showing WAY lower efficiency than I normally see, so it's quite concerning.

Of course new tires will be less efficient until they get worn in, but it shouldn't be THAT big a difference right? I'm considering swapping them out for the Territory ATs.

Keep in mind changing seasons and temperatures. I'd also try resetting one of your trip computers (A or B) and keeping track of it. And did you stay with same size?

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[kosan]

Keep in mind changing seasons and temperatures. I'd also try resetting one of your trip computers (A or B) and keeping track of it. And did you stay with same size?

Yeah changing seasons changes things but things haven't changed dramatically yet, and certainly not in just one day. Kept same 275 65r20 size, and yeah I reset trip B to track the new tires. Of course it's only 30 miles but it seems dramatic to be around 66% of my previous efficiency.

 

[Riviot]

Yeah changing seasons changes things but things haven't changed dramatically yet, and certainly not in just one day. Kept same 275 65r20 size, and yeah I reset trip B to track the new tires. Of course it's only 30 miles but it seems dramatic to be around 66% of my previous efficiency.

Did you manually check tire pressure? Not the dash reading, but with a gauge.

 

[kosan]

Did you manually check tire pressure? Not the dash reading, but with a gauge.

No. I did check the dash reading and I guess assumed Goodyear knew what they were doing, but I'll grab my gauge and check it myself.

 

[Riviot]

No. I did check the dash reading and I guess assumed Goodyear knew what they were doing, but I'll grab my gauge and check it myself.

Even Rivian doesn't fill appropriately sometimes, they'll go to 48psi on the display but that's really like 46psi. Highly recommend a gauge to 48psi.

 

[UnsungZero_OldTimeAdMan]

Even Rivian doesn't fill appropriately sometimes, they'll go to 48psi on the display but that's really like 46psi. Highly recommend a gauge to 48psi.

I think the key is to use a gauge [that you trust] and stick to it consistently. The built-in compressor's gauge is also inconsistent to what TPMS reports on the driver display. This past weekend I refilled and equalized all four with my 4-tire inflation kit. When the compressor read 48 psi, the gauge on my inflation kit's manifold said 52. It was a warm afternoon in the mid 70s. I went for a quick drive and the driver display read 52 once it updated. Had I gone by what the compressor said, I would have probably been low at 45 or 46 by night (in the "cold"). Owner's Guide recommendation of 48 is "when cold".

 

[Burton06]

These tires sound pretty good. Branding looks ugly though lol. hoping to hear more from others experiences on efficiency change from the pirellis.

I’m keeping my eye out on the Bridgestone dueler AT Ascent. Those are not designed specifically for EVs but they seem to have really good reviews

 

[Singletracker]

I just put a set of Bridgestone Ascents on my R1T - LT275/65-20. The first fews day, my efficiency was down about 20%. I was expecting a bit of a hit, but not that much. Why was this happening? Well, for one thing we had a bit of an early season cold snap that perfectly coincided with the installation of my new tires. My overnight lows were near freezing and the HVB was about 40º in the morning, and very reluctant to warm up. Second, the tire pressure had been set at 50 psi. The weather has since warmed up a bit, but I decided to manually heat the HVB by preconditioning it. That raised the HVB temp to about 71º, prime operating temperature. Second, I raised the tire pressure to 60 psi. Guess what. My efficiency dramatically increased and seems to have returned to almost normal. Not sure whether heating the battery or raising the tire pressure was mostly responsible for the gains. I suspect it was about 50/50. I only have a couple of days worth of sample, so we’ll see how it pans out going forward.

 

[Singletracker]

Even Rivian doesn't fill appropriately sometimes, they'll go to 48psi on the display but that's really like 46psi. Highly recommend a gauge to 48psi.

In my experience, tire installers attention to details, like exact tire pressure, often leaves a bit to be desired. I, too, highly recommend that owners check their tire pressure with a good gauge. It’s funny, but, my in car display also always reads about 2 lbs less than my digital gauge. Don’t know which is the real deal.

 

[Riviot]

Not sure whether heating the battery or raising the tire pressure was mostly responsible for the gains. I suspect it was about 50/50.

What tires did you come from? And what MPK numbers are you seeing? I'm slowly joining the group here who believes LT are more appropriate for our trucks, especially if off-roading or towing, but my beancounter self is nagging about $/mi between tire cost/life and efficiency drops.

I keep telling that beancounter to factor in risk costs of a blowout while doing anything with the truck, but he won't listen, he's self-insured.

In my experience, tire installers attention to details, like exact tire pressure, often leaves a bit to be desired. I, too, highly recommend that owners check their tire pressure with a good gauge. It’s funny, but, my in car display also always reads about 2 lbs less than my digital gauge. Don’t know which is the real deal.

I recently swapped on my AT after a recent visit to a Service Center. Not only were the AS under inflated, but my lugnuts were so far over torqued that my air gun at max (150psi) couldn't get them to budge. I had to borrow a 4' pipe from my neighbor to make a breaker bar and stand on it. That's the first time in 70k miles and 10ish swaps I've had to do that.

 

[Singletracker]

What tires did you come from? And what MPK numbers are you seeing? I'm slowly joining the group here who believes LT are more appropriate for our trucks, especially if off-roading or towing, but my beancounter self is nagging about $/mi between tire cost/life and efficiency drops.

I keep telling that beancounter to factor in risk costs of a blowout while doing anything with the truck, but he won't listen, he's self-insured.



I recently swapped on my AT after a recent visit to a Service Center. Not only were the AS under inflated, but my lugnuts were so far over torqued that my air gun at max (150psi) couldn't get them to budge. I had to borrow a 4' pipe from my neighbor to make a breaker bar and stand on it. That's the first time in 70k miles and 10ish swaps I've had to do that.

I came off the original Pirelli Scorpions. I’m including an attachment that details some of my 2025 efficiency data. Oddly, I had a huge spike in efficiency in September, that seemed to be carrying over into October, UNTIL I put the new Bridgestone Ascents LT’s on. I have no idea why there was such a jump in efficiency in Sept. Now, with the LT tire pressure increase and taking into account the HVB temp, efficiency seems to be returning to near where it was is in September. But, I only have a very small sample size. We’ll see if that holds up with more miles and colder days ahead. I am encouraged that there may not be as much of an efficiency hit with the LT’s as I had anticipated. The main reason I went with LT’s is that I do off-road and wanted the extra durability. Somehow, running around in a 7000+ lbs vehicle, especially off road, on SL rated tires doesn’t seem prudent.

I also agree that people should check their lug nut torque after a tire service. in my experience, these tire service people rarely get it right, or even close.

 

[Riviot]

I have no idea why there was such a jump in efficiency in Sept.

I had a similar spike in September. What I noticed is less HVAC use and the HVB temps were still in a happy 80-90° zone each morning. October, still no HVAC but HVB temp dropping. August, higher HVAC use.

 

[UnsungZero_OldTimeAdMan]

I had a similar spike in September. What I noticed is less HVAC use and the HVB temps were still in a happy 80-90° zone each morning. October, still no HVAC but HVB temp dropping. August, higher HVAC use.

That makes perfect sense. And probably less energy used to condition the HV pack as well huh?

 

[Riviot]

That makes perfect sense. And probably less energy used to condition the HV pack as well huh?

 

[Singletracker]

Yeah, so many variables - tires, HVB temp, HVAC use, wind, speed, terrain, etc. All I know is, for me, 2025 has produced waaay better overall efficiency than previous years. Dunno why.

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