Quote:
Originally Posted by Taylor95
Lol, but you said you got a 5% gain by reducing tire/wheel weight by 28 lbs.
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I actually never mentioned weight until you asked.
"mpg from 265/65/17 to 245/75/17LRR was about 5%"
But yes my main point is mpg is gained by reducing width and friction
265 STD -> 245 LRR
and if you're vehicle isn't geared numerically low enough going to a taller tire helps.
30.56" -> 31.47" (+3%) (drops RPM for me above 45 mph but still 2000+ RPM at 70
)
I assume 90% of the gain is from width, frontal area, and gearing decrease. Maybe 10% of the gain or less is from weight (Less than 0.5% which i consider unmeasurable)