[oletrucks] Tire size vs mpg

[J Forbes <jforbes@primenet.com>]

Hey, don't make it complicated!  If your tires are 30" tall, and you add
an inch, it's about 3% difference...so your speed (at same rpm) will go
up 3%, or about 2 mph at highway speed (65 mph).

If you want the drop in rpm for increasing your tire by 1" (assuming the
same mph), it's 3% again, or about 100 rpm if you were turning about
3000 to 3500 rpm before the change.

Easy math    :)

Jim
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959