My boat is about 2900LBs I'm getting about 11.5-13mpg on the highway. Is this about what all other people towing are getting? When not towing a mix of city and hwy I get about 17.9 to 18.5mpg. Have not been able to break over 20 yet but Have not taken any longs trips w/o towing the boat. I think in an all hwy trip I should get a good 22mpg.