Tires pressure and efficiency

[LL75]

For the past two days, I decided to increase my pressure from 47 cold (discount tires recommendation) to 49 psi. Definitely see increase in efficiency and ride still feel the same. Weather in Dallas has been consistent around 70 to 80 degree. My current setupis Atomic wheels Aw09 with general grabbers HTS60 275/60/20. These tires max pressure is 51 psi. Below is the data by Electrify and by far the best efficiency I had in these tires since I got them. I have about 1700 miles on it. Drives are in All Purpose Mode

	7 Drives
Total Miles Driven	75.55
Rated Miles Used	80.78
Efficiency	93.53 %
Time Driven	1 Hours 42 Minutes
kWh Used	29.33 kWh
Wh/Mile	388 Wh
Battery	25.7%
Cost	$ 3.67
Average Temp	79.78 F

	8 Drives
Total Miles Driven	45.06
Rated Miles Used	45.98
Efficiency	98 %
Time Driven	1 Hours 8 Minutes
kWh Used	16.69 kWh
Wh/Mile	370 Wh
Battery	15.1%
Cost	$ 2.09
Average Temp	71.07 F

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[Jeep Addict]

Interesting data. Intuitively I would expect to see this correlation between increased air pressure and increased efficiency. Curious to know if there is any effect on wear or performance in different weather conditions.

 

[SwampNut]

You've taken an inch off your total tire height and reduced the carcass stiffness, some tuning will make big changes. Have you tried a chalk test?

https://www.intercotire.com/using_chalk_method_determining_psi

 

[LL75]

You've taken an inch off your total tire height and reduced the carcass stiffness, some tuning will make big changes. Have you tried a chalk test?

https://www.intercotire.com/using_chalk_method_determining_psi

I have not. so, increase 2 psi on the tires will take an inch off of tire height?

 

[SwampNut]

so, increase 2 psi on the tires will take an inch off of tire height?

No, you said you went to a 60 profile tire, which is about an inch shorter. Stock on 20" wheels is 65 profile.

 

[LL75]

No, you said you went to a 60 profile tire, which is about an inch shorter. Stock on 20" wheels is 65 profile.

OH ok. I have no preference of comparision to the 275/65/20 tires since I switched from 21" OEM. The ride is pretty much the same as the 21" with my current set up.

 

[mikehmb]

What is Total Miles vs. Rated Miles?

 

[LL75]

What is Total Miles vs. Rated Miles?

Total miles is actual miles driven.
Rated Miles is the miles displayed by your Rivian using a preset epa rated consumption rate. (prediction based on your driving)

Efficiency is total miles/rated miles

 

[Riviot]

Efficiency is total miles/rated miles

Efficiency standard is mi/kWh or Wh/mi, like ICE fuel efficiency is mpg

 

[LL75]

Efficiency standard is mi/kWh or Wh/mi, like ICE fuel efficiency is mpg

if you take the total miles / kwh used. then you would get mi/kwh.

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