I have a 05 cummins. driving around town or on the highway I can pull about 20 to 30 MPG but i was driving up north to go fishing I had a sled trailler with 2 quads and a snowmobile milage was good until we hit temptures below -15 to -20 I went from getting 20 MPG to 9 MPG. I was just wondering if there is anything that i can do to fix this prolbem so it dosnt happen again

Thanks.

 

maybe a fuel heater would help. Or go south to go fishing. LOL to cold for me.

 

what kind of up grades do you have on the cummins to get 30mpg ?

 

30mpg... No but what do you expect your pulling a trailer the motor loves heat and that's hard to maintain at -20 plus you were burning winter blend diesel that does and will affect fuel mileage. There's nothing wrong with the truck just your math at acquiring your fuel mileage. Next time you fill up record the mileage then when you fill up again record the gallons used and tell us what your mileage is.

 

Hey now my 06 get about 28 empty you do the math for me 36 gal I made it 984 mi on the highway straight at 75 mph so 984/36=27.333 truck said I was get 28 reset it when I topped off and red_rattler could be feul on road comes with antigel in it tho and the truck should hold running temp even in -40 f if not their may be a thermostat issue