Tire width and consuming Fuel

I’am using small wide tires in my car . Few days ago I decided to change the tires to a bigger one in width ,but I read this article about the relation ship between tire width and fuel consuming and I though it would much better if I don’t .

You don’t list your vehicle or what size wheels and tire are supposed to be on it. If you are concerned about your miles per gallon then have the stock tires at the correct pressure and watch your driving habits.

@cdaquila Me thinks Spam because the blog appears to be by the same name as the new poster.

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Google Translate worked overtime on that one

Stock tires on my 2010 Kia Forte are 215/45/17. I have replaced them twice with the same size. It gets 40+ mpg on long trips.

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Low Rolling Resistance (LRR) tires used on hybrids are narrower to increase gas mileage. I doubt that increasing the diameter will have a beneficial effect if gas mileage is what you are after.

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Well, hybrids might use narrower tires, but that’s in addition to them being LRR designs.

Here are my web pages on the subject:



Short version: There is a HUGE difference in RR for tires within the same size - up to 60%.

The difference between tires of one size different is small - fractions of a percent - - all other things being equal.

Wider tires do have small improvements in RR - all other things being equal - and by wider, I mean the other dimensions stay the same - say: P205/70R15 to P215/70R15. This does not count what affect the larger diameter has on engine efficiency.

There is a technological triangle involving treadwear, traction (especially wet traction), and rolling resistance. Trying to improve one area results in a sacrifice in one or both of the others. That’s why OE tires - the tires that come on new cars from the factory - have such a bad reputation: They were selected for their RR - to the detriment of wear and traction - and since the vehicle manufacturers don’t warrant tires ……. (Side note: OE tire do NOT have a mileage warranty. Only a basic materials and workmanship warranty - because the OEM’s don’t buy the mileage warranty in order to save money.)

Lastly, LRR is a relative term, not an absolute one. It means that the tire gets better RR than tires with comparable treadwear and traction characteristics. As a result, it is not uncommon for some tires labeled LRR to get WORSE fuel economy than others not so labeled.

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