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I was using inaccurate figures for the earlier calculation. Ok here are some different figures that should be closer. At 60mpg diesel and 20mpg propane and a 3:1 ratio propane:diesel here is the math. 3 x 20 = 60 for 3 gallons of propane. 1 x 60 = 60 for 1 gallon of diesel. 60 + 60 = 120 miles. 120 miles / 4 gallons total diesel plus propane combined = 30mpg. So this means this will give you a max of 30mpg assuming a 3:1 ratio and the minimum will be what ever the truck normally gets on diesel. Assuming 2:1 ratio the best would be 33mpg. Does this sound more reasonable? Not clear on what ratio gives 60mpg diesel and 20mpg propane so 30-33mpg max?
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