Remember that MPG relies on your *mileage* calculation being
accurate... so just as if you had changed your gear ratio, you'd have
to remember your odometer (and spedo) will be a little off. On bigger
tires, you travel farther with each tire revolution. So your odo will
show a shorter distance than actually traveled; if you use your odo to
calculate MPG, your MPG will show lower than actual. But back to the
quesiton, yes you'll also get a little lower *actual* MPG with bigger
tires too. :)
Interestingly OMC side-note: the transmission in my truck is from a
'94. The spedometer (and odo) were never accurate with stock tires.
Now I've got 31x10.5s on there, and the spedo matches my GPS speed
exactly! Odd. I can't imagine the previous owner intentionally changed
the spedo pinion... the truck was a daily driver/beater with stock
suspension (torsion bars not even raised).
Don in CT
On 10/25/06, jon@dakota-truck.net <jon@dakota-truck.net> wrote:
>
> Phillip Batson <pbatson68@yahoo.com> wrote:
>
> : hahaha! I think it just dawned on my why my avg mpg is around 12. I forgot that I had originally replaced the stock tires with 31x10.5x15 tires. Bigger & wider = less mpg, right?
>
>
> Yep, usually. Especially if they are heavier as well. Regarding
> your original question, I believe a 2000 Dakota 4x4 would have come
> with 15" rims. I'm not sure on the width, but if I had to guess I'd
> say 8".
>
>
> --
> -Jon-
>
> .- Jon Steiger -- jon@dakota-truck.net or jon@jonsteiger.com -.
> | '96 Kolb Firefly, '96 Suzuki Intruder, Miscellaneous Mopars |
> `-------------------------------- http://www.jonsteiger.com --'
>
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