My 340 gets about 80 miles out of a 10 gallon tank...and uses a 1/2 litre of oil at the same time, I would aim for something better than that with your build and I’m sure you’ll be successful...
At 8mpg I hope you have more smiles/gallon because of all the power or you just can't keep your foot out of it. Oh BTW ditch those Total Seal Gapless tops and let us know if the mileage change. J.Rob
