55 MPG!!?? Really?? Wow!! What speeds are you travelling to get this outstanding mileage? I figure if I get 45 MPG at a reasonable speed I'm doing really good - and that is calculated with a larger Imperial gallon vs a US gallon. Good on ya....I am @ 55 MPG on the nose, if you look @ HD site it says in foot note5 some riders may get better mileage this is based on 5 gallons not 6
Don't think tank size has much effect on gas mileage only range...
Cheers
Doug