Renegar

Thanks to feedback on the forums, I am considering going 245/40-19 (front) and 275/35-19 (rear) for my next set. I'm curious if anyone here has noticed any significant impact on gas mileage running wider tires. Feedback anyone?

Mike

iTrader: (1)

Generally people who run wider tires drive harder and have a low baseline MPG to begin with.

Here's the "theory". Wider tires add unsprung weight, which introduces more drivetrain loss, so you effectively put less power to the ground. Thus, to accelerate at the same rate as before, you have to give the car more gas.

In addition, if you get the same model tire, you increase rolling resistance, again, introducing more drivetrain loss.

In reality, it won't make a huge impact for daily driving.

PureNick

iTrader: (2)

It'd be less than 1-1.5mpg loss, at most or if any...

oh, and if you're looking for an amazing setup (which tires) for 245/275... I HIGHLY suggest trying these tires:

Fronts: http://www.tirerack.com/tires/tires....=Ventus+S1+evo
Rears: http://www.tirerack.com/tires/tires....Eagle+F1+GS-D3

I had the Goodyear F1's mounted in the front and felt a little slippage during fast turns but the rears kept planted. So I changed to the Hankooks just to give it a shot. This combo is amazing. Absolutely no hydroplaning, the road noise is almost non-existent, great reviews on tread wear (haven't had them long enough to tell you personally), both are 280 tread wear (stock potenza's are 140) as well as 98W(load) rated tires with ZR speed ratings, dry grip is amazing with no drama(squealing), and all this for a little under $600! I paid $584.91 total.

You honestly cannot beat that. Better price with a crap ton better performance than the stockers. And if you're wondering why TireRack is closing out the Hankooks, it's because they're making way for the new version of it called the "EVO V12". Never the less, this version is still great.

Anyway, hope this helps

w0ady

iTrader: (1)

i saw almost no change going to wider tires on the stock wheels. maybe .5 mpg if that much. or it could have just been driving habits like people said.

Black Betty

iTrader: (60)

The simple answer is that the wider tires themselves with all other factors being equal will decrease your gas mileage, but not significantly. The only difference is a greater contact patch which = greater amount of friction (traction) and slightly more unsprung weight. Neither in a significant amount to noticeable decrease your mileage in the size you are considering.

Mike is correct, as he often is.

notalk

Not exactly. The Ventus V12 Evo has been out for a while now. But, Tire Rack is not a full-line Hankook dealer and Hankook does not want Tire Rack to carry the V12 Evo. Tire Rack will not be replacing their current Hankook with the V12 Evo.

So, by recommending the existing Tire Rack Hankook tire, you are recommending to fellow forumites they buy something less than a current updated model tire.

Renegar

Thanks for the feedback guys. It's been my experience on other cars that a wider tire has not had any seriously noticeable change in gas mileage, but I've also not gone from a 245 up to a 275, so thanks again.

Actually I'm highly considering the Hankook Ventus V12 Evo K110's. I did consider the S1 evo's then read that the V12 Evo's are better all around.

PureNick

iTrader: (2)

I was simply going by what I was told by someone at TireRack when I called and asked about how good the Evo S1 was, why it was being closed out, and if it would be a good application to my sport coupe.

The information I said was simply passed down to what I was told over the phone

Neal@tirerack

iTrader: (2)

Be really hard, near impossible, to measure that accurately. Way too many outside factors that would need to be exactly the same for you to get correct numbers.

AvosG37

iTrader: (4)

i have 285 tires for the rear. i felt a lot of improve handling but eat little more gas. i think the rims r kinda heavy.

Renegar

I was reminded that the 370Z comes with 245/40-19 (front) and 275/35-19 (rear) and it's gas mileage isn't much different, plus as Neal said, their appear to be a lot of variables. Overall it seems the answer is that it is very negligable.

Loi

iTrader: (12)

I think it does have an affect on the gas mileage, wider tires are probably heavier then stocks, so more weight to be carried around.

Renegar

Of course, but based on the feedback and research following the original post, it seems it's not enough to be worried about.