Clanny......What kind of tranny are you running? That is incredible, I have yet to replace my o2 sensor to a 4 wire, or do cap/rotor and I have a J1 tranny but I am still only getting 24 mpg. And I calculate 39 mpg for you, 320 miles into 31 liters which is 8.2 gallons=39.02 mpg, but at any...