|
Makes no sense.
The type of tire does more than their size.
As long as the outer diameter is the same, the MPG should be the same.
Unless of course, you'd be comparing crappy tires with good ones.
In fact, larger rims should give you BETTER fuel economy, not worse.
My estimation is, this is just EPA ratings.
Nothing to do with real world fuel mileage.
My Chevrolet Cruze had a 32/34/40 MPG rating or something. Almost identical to the Honda Civic of the time.
Turns out my Cruze had nearly 40MPG AVG, and highway MPG was closer to 50MPG.
Honda on the other hand, had a lawsuit and fines to pay, to pay the difference to anyone owning a civic which's highway was rated 40MPG. Those people received cheques to pay the difference for cheating the EPA ratings.
Their next year model, Honda put 38 or 39MPG, which was the correct value.
Just to say, EPA values are to be taken with a grain of salt.
|