No if you put a stock 17 with correct tyre next to a stock 19 with correct tyre there the same size, so no difference in fuel or acceleration, the tyre profile is different to make up the difference, thats why 19 always give a harder ride, because the profile is smaller. however if you were to fit a 19 with the same sizes profile as a 17 then the overall size would be bigger. However, the profile is a % of the width, not an actual measurment of the depth of the profile.