Quote:
Originally Posted by cfg83
Big Dave -
Can you tell me the typical before/after tire size change you are talking about? Can you point to a non-ecomodder thread on this?
CarloSW2
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I can do this, as I experienced exactly what BD was talking about.
my stock tire size on my Ranger was 225/65/15 on steel rims.
I changed my rims and put on a set of aluminum 15x10 sport rims, with tires sized 255/70/15 a difference of about 8.75% increase in diameter, from 26.5" to 29.0"
initially saw a slight increase in mpg on the hwy, but a decrease in any sort of driving I had to do in town. but also on the hwy, my truck would need to downshift from OD into drive, and sometimes even down to 3rd, just to go over a simple overpass.
then I dropped to 255/60/15 tires, which brought the diameter of my tires within 1% of stock diameter, and both my hwy and my in town mpg increase by a fraction (this was all going by tank fill ups)
the truck also would no longer need to drop out of OD to go over an overpass.
average tank with stock: 240-280(best) miles mixed
average tank with the 29"D was about 240-300(best) mixed
average tank with 27"D was 260-340(best) mixed.
that was with no real hypermiling techniques used (other than timed lights and drafting, which Ive always done)
once I sarted really paying attention to my driving habits, I was able to get close to 400 miles from my tank.
so I would say your best bet overall would be to only go up 1 size (if running 50's, go to 55's) if possible, go a little skinnier (if running 225 try and go 215)
and look for LRR tires (
Low
Rolling
Resistance)