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Originally Posted by Eric5273
The key to your statement is "if all else is equal". Unfortunately, it never is. In reality, larger wheels are usually heavier, so your gas mileage will decrease slightly. Also, if your new wheels and tires are wider, there will be more wind resistance, which will also lower gas mileage. But the difference we are talking here is rather minimal. Maybe 10% difference at most, unless you are putting monster tire sized wheels on your truck.
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Right. I guess unless you found some lightweight racing wheels that were also the same width as the stock rims, then you are probably going to lose MPG's due to the added weight and increased contact patch.
I guess the manufacturer probably takes all of that into consideration when deciding what size wheels to put standard on the car to begin with.