i have a 2004 drw quad cab auto 3.73 just towed a 40 ft gooseneck round trip from connecticut to florida(trailer weighs about 12,000# loaded)about 2400 miles had cruise at 70mph 90 percent of the way the best i could do for mileage was 10.3 does this sound right?the truck is bone stock and only has 19,000 original miles(i bought new)any help?am i missing something?

 

i don't think that was bad. your rings may have not seated yet. in other words your motor is not broke in yet.how often do you drive it? when you drive are you pulling something heavy?

 

I bought mine with 29k miles on it. Now that i am up to 53k, my mileage has improved by about 1.5-2mpg. I think it is the break in time. Maybe its just that i drive it nicer now.

 

usually the only time i drive it is pulling the trailer

 

70 mph with 12K in weight towing, with low miles... you're lucky you got that good of mileage in my opinion. I have over 185,000, use every synthetic lube you can use to cut friction, buy fuel additive and have a few electronics to help with my mileage and when I hook onto our gooseneck 3-axle I'm lucky to squeeze 15-17 mpg and that's running the speedlimit (55 here in Kalifornia) on level ground!
Granted, I can get a bunch more mpg empty on flat ground running the same way but we're talking towing here.
Wait until you get about 80K miles then it'll start coming around on fuel mileage. Between 75K and 125K I picked up about 3 mpg.
just hang in there. It gets better, and slow down a bit, you'll be amazed how much the air you're pushing sucks the fuel.

(oh, nice race car... we've been in NHRA for about 26 yrs now, run a TAD) www.penztoy.com