Duramax vs Power Stroke Fuel Economy Tow Test and Drag Race

ktmrfs wrote:


agreed on the DEF useage. DEF consumption should be around 1 gallon/100 gallons of fuel. Can vary some, but 200 miles/gallon of DEF???? nope. something is amiss.

I wish I was getting 1 gallon of DEF for 100 gallon of fuel. The one time I did check it was 1 gallon of DEF for 42 gallons of diesel. 5 gallons of DEF in 2400 miles, over that 2800 mile trip we averaged just over 11 mpg. The L5P is a DEF hog!