315/70 vs 37 performance difference..

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ChaseH

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Has anyone tested the performance difference between a truck with the c rated 315/70s and the 37"s? On paper it shouldn't make much of a difference but Im curious if anyone has experimented.
 

Kojack19

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Dropped a solid 1.5 mpg too. My Gen 2 averaged 15 and getting 13.5 in my Gen 3 with BFG 37s both trucks on same Method wheels. I drive my kids a bunch too so I am not heavy footed all the time.
 

Gsteve

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can a guy reflash the ecu to 35 spec if and when you change tires and want to go to 35S?
 

Ta2punk

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can a guy reflash the ecu to 35 spec if and when you change tires and want to go to 35S?

I don't see why that would be necessary. It's going to perform better and get better gas mileage just going from 37 to 35in tires. The engines aren't tuned differently between the two tire sizes other than maybe speedometer calibration.
 
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