[CBR_Raven]

Are you towing or hauling anything really heavy?
Do you let the truck sit and idle for long periods of time?
Are you driving mostly city or highway?

If you're doing mostly city driving then you could very well average in a range from 7mpg to 10mpg...if you're towing/hauling anything heavy, that will make a big decline in MPG as well...also, letting the truck sit at idle for long periods of time will affect the average MPG.

I'm averaging 12.1MPG right now with a mix of city and highway driving...however, I've seen my MPG decline badly when I'm doing any of the things I mentioned above.