MPG without a trailor attached?

11 to 13 mpg bobtailing. pre emissions 12.7 detroit in a high rise coronado glider. i do not use the cruise and drive slow

 

55 mph I get average 15.5-16.5 bobtail, depending on how flat it is, could be higher. 2011 prostar ISX-15 CM871, 3.55-rears,10-spd eaton,lowered front end,many modifications for fuel economy.

 

My old Chevy pickup doesn't even do that good!

 

Since I am leased to a power only company, I bobtail at least 15,000 miles per year, sometimes over 500 miles between trailers. If I keep it at 56-60 I will get about 11 mpg, if I go over 65 it drops to 9.5-10.5.
168" wheelbase cabover no less. And if you pay attention during bad weather, it isn't too bad...

 

Thanks so much to everyone who has contributed! Keep them coming!

 

Do you think that with a set up of a single rear axle , 12.7 Detroit , 10 speed , condo driving between 55-60 - you could average 12 mpg ? Might be doing something very similar to this in the near future and was just wondering .

 

I hear that. I did a 180 one time on a wet street. Slid right into the curb between two parked cars pointed in the opposite direction of where I was going. It looked like just like a movie stunt. No damage to anything. The two women walking on the sidewalk gave me some dirty looks. As if I actually meant to do that.

 

KW W900L: 11 MPG (Cummins ISX)
KW T2000: 13 MPG (Cummins ISX)
FL Columbia: 12 MPG (Series 60 Detroit)

 

Pulling an empty flat @ 57-60 MPH I get a solid 10 MPG measured over an 1100 mile sample size. I haven't bobtailed more than one block in years.

 

If you bobtail over 60mph you might as well be pulling a trailer. Unless you can keep rpms down.