Lot of people are putting different wheel sizes on their car for several reasons. We all now that bigger/smaller wheels will effect our speedometer. Does it mean that size of wheels will effect mileage as well as speedo? For example 155/70/13 to 195/55/15 would make a -8.11% speedo error. If we would put this wheels on car from new after 150000 car really done 137835? cheers