View Single Post
Old 04-05-2022, 10:06 AM   #26 (permalink)
Master EcoModder
Join Date: Dec 2010
Location: USA
Posts: 1,157

Sport Utility Prius - '10 Toyota Prius II
90 day: 52.98 mpg (US)

Sequoia - '04 Toyota Sequoia Limited
90 day: 17.51 mpg (US)
Thanks: 348
Thanked 257 Times in 206 Posts
Originally Posted by Taylor95 View Post
Lol, but you said you got a 5% gain by reducing tire/wheel weight by 28 lbs.
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)
"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
  Reply With Quote
The Following 2 Users Say Thank You to hayden55 For This Useful Post:
freebeard (04-05-2022), Taylor95 (04-05-2022)