I had a 19 touring fwd with my 20 inch Asanti inch wheels. Stocks were 17x7.5 (225/65/17) weighing 59lbs vs the 20x8.5 weighing 49lbs (255/45/20).
For the 2 years of ownership and 28k miles I could never get better than 21/22 average mpg and I drove like a grandpa the first year trying to get...