There is so much Ethanol in our fuel here in Washington, the best I can get is a little over 9˝ miles per gallon. Also, I believe that the Godzilla just might be a little bit more efficient than the V-10. While I only have 305 horsepower and you have 350, I have never felt I needed more power. Clearly, that Godzilla is the best gasoline-powered heavy-duty truck motor Ford has ever made. I am glad you have it!
2019 Minnie Winnie 22M on an E-450 frame