Here's some mpg info on the S5: http://www.fuelly.com/car/audi/s5. Go for the V8 S5 if you can, we have both an A5 and an S5 in our garage and the S5 is a lot more fun. If you do a lot of city driving you could be in the single digit mpgs, but the noise it makes makes it all worth it! Good luck with your purchase!