nohemihere said:I have a cummins. I routinely pull a skid loader with it. And it wieghs almost 10,000lbs with the trailer. I get on average about 14mpg. If i slow down to 65 I can get that up to about 15.5. So it depends on how much your time is worth. But shaving a few mph off can save you some green at the pumps. BTW my truck gets on average about 18mpg empty. And once I had one tank get 22.3 on the highway. But like I said that was once.