I,ve got a 2013 Downtown 300 and getting 75 mpg. I,m thinking about getting a new Exciting 500 due to the fact I,m having a hard time with the seat on the DT 300. It is extremely uncomfortable and very hard on my lower extremidites. What would be the average mpg on the Exciting 500 vs the DT 300. The Exciting 500 is a little larger bike and the seat is more comfortable