Is this MPG normal? How can I increase mpg?

how much empty mi.

 

No that is not normal at all. Hand calculate the mpg first, as the odometer computer is not always accurate. Also, do you have a boost gauge?

 

is it governed? do you stand on the pedal to go as fast as it will go all the time over any terrain until you get to the destination? if yes, then probably.

 

The international 9200i's usually get about 6.5ish and the pre-emissions engines can get 7 or more. My freightliner gets 7.5mpg loaded with 45k. Does the truck smoke a lot?

 

Mileage has nothing to do with it unless if you don't follow up on maintenance. I had an overhaul done 180k miles ago and its at 1.2 million miles now. When I bought it, there was about 600k miles on it and even though it was low on power back then, i made no less than 6.5mpg loaded. Its a 2005 freightliner century

 

If your making a cat tach over 1500 your burning uneccisaru fuel. I've drove them when they were mechanicals to the new ones, cat is low RPMS even for a diesel. Also the worst thing you can do for a cat is cowboy it, they like slow smooth shifts. Standing on it to get somewhere is a waste with a cat. I don't know what your platform weight is but that could have something to do with it. Also what kinda terrain.

I've got a 425 mechanical cat with 2 million on it so 650k isn't a lot either.

 

Exactly, that goes for other heavy duty diesel engines as well. Keep the RPM's below 1500 when shifting and you'll make some money.