Mileage was calculated using a gps tracking app on my phone, never bothered to hook up the speedo. Car is currently 2300lbs, 4spd manual, on radials with fairly good aero. TruTrac diff allows it to roll pretty free thru the corners. Low compression pump gas engine with nitrous, it'll also do 70mph in 1st gear :) Here's a link to the car's build page- http://grannys.tripod.com/20102.html