I was just wondering how many miles people are getting from a tank that run 19's? With oem 18's i got around 330miles per tank but now after getting 19's im getting about 280. Just wondering what others are getting roughly. Setup is 19x9.5 with 255/35 and 19x10.5 with 285/35

 

I know that bigger the rim of the wheel, the heavier it is. so it reduces mpg quite a bit. i got 18's and i get 21 mpg.

 

50 mpg is not a big deal... Like everything in life, you gotta pay to play....

 

a 50 mile per tank reduction is a significant drop from just wheels, assuming they aren't made of lead

my guess is something else has caused the reduction...9 times out of 10, it's the driver

fwiw on my car, built NA motor (DE, non revup, not an HR), 19's (265/285) and a 4.3 final drive, I get ~300 per tank. Perhaps with your new found grip, you've gotten a bit heavier on the throttle?

 

18 19 or 20-inch wheels. Why would that matter? The car does not roll on wheels: it rolls on tires.

 

it can matter, based on weight

 

I have 19X9 & 19x10 and get 21 mpg city....

 

wheel wise im running the same set up 19x9.5 & 19x10.5. Typically if i drive heavily on the highway I will get 330 miles on a single tank. If I drive city only, I tend to have a lead foot, so that drops heavily to 250 or so.

 

Hmm my 18s get me 350+ miles a tank

 

Welcome to something called rolling resistance. Tires have friction and all forms of friction involve a certain amount of loss. The wider the tires, the more rubber in contact with the road which means more traction and also more loss through rolling resistance.

When I went from the 18" OEM wheels to 19" Volks (same sizes are you) I saw my highway mileage drop about 3MPG. Think about it - 3MPG on a 18 gallon tank of gas is a little over 50 miles per tank.

I was able to gain 2 MPG back by switching to synthetic in my transmission and diff.

As the old saying goes - "you have to pay to play". If you want to be a baller with 19" wheels and wide tires, there's a penalty to pay for it.

You didn't mention what wheels you "upgraded" or "downgraded" to. As pointed out before, heavier wheels also cost you some performance aspect. My Volks and PS2s are 11 lbs per corner lighter than OEM so I was able to pick up a little there. Since the 19" wheel/tire setup puts the weight a little further from the axis of rotation, it's pretty much a wash as far as rotational inertia goes (won't slow acceleration down).

 

In addition to the rolling resistance, the wider tires also offer more resistance to the air. Pushing the wider tires through the air creates significantly more drag than narrower tires.

 

i get 400 miles on one tank of gas.. thats daily driving 80 miles with 93 octane about 25% city/75% hwy

i have always been amazed with my mileage ever since i bought my car

 

Virtually all of the tire is inside the wheel well so it's not really that big of a problem, especially at our relatively slow speeds. Unlike an F1 car where aerodynamics plays such a large role, their huge exposed tires at 200+ MPH there is significant drag.