18's and MPG

[Grayguy]

I've searched an haven't found what I need...
How much of a loss in mileage would I experience going from my stock wheels/tires to 18x8's and low profile tires? I assume the added rolling mass will affect it, but how much?

[Toysrme]

If you are plus sizing not much at all.

[atobe]

hard to say it's gonna eat more gas while accelerating but it'll eat less gas while crusing. if you got a lot of stop/go driving u might notice a different if u do a lot of freeway driving probbly none

[Grayguy]

Well, I drive 40+ miles a day about 50/50 city/highway, so i guess It wont be too drastic. I'd just like to keep my 29mpg average if I can...but as long as it stays above 25 or so it shouldn't be a big deal. Thanks guys

[Eye8Pussies]

I'd be more worried about how slow your car will be instead of how your gas mileage will be actually....

[CDub LXi]

I run 18s and I didn't really notice a drop in fuel economy at all. In the city I only get about 300 miles to a tank and on the freeway I get 480 .

I really can't tell my car is any slower with the 18s either... it was slow to begin with.

[Grayguy]

Why would my car be slower, the extra weight, or the effective gear ratio change? Also, how far off would my speedo/odometer be?

[atobe]

http://www.powerdog.com/tiresize.cgi go here and see

[Eye8Pussies]

the extra weight

[BullMarket]

No difference. PLEASE keep your tire size close to what your factory size was in diameter

BULLMKT

[trdcamrygracia]

my car is weird...after 18" rims....i got 15 miles more on each tank...

[Super Kaioken]

maybe lighter rims? or something would help mpg? don't alloys weight a lot? well if i get chrome it'll be heavy.

[Grayguy]

Ok, I think I can accept any minor performance loses I would suffer, seeing as how this car is my daily driver/ cruiser. After all, I do have a truck with a nice V8 for when I want to feel some performance...

Originally Posted by Grayguy

how far off would my speedo/odometer be?

^so how about it...