Recorded a full tank today at 38.5mpg. I'm pretty happy considering this tank included several trips with multiple appliances on the flat bed.
My mileage actually doesn't decrease if I have either 1 or 2 appliances on the back if I lay them on their side. What I gain in weight I can make up for in aero by laying them on their sides directly behind the cab.
I lose roughly 3mpg with one upright appliance or 6 with 2 upright. After that it's about minus 1mpg for each additional up to a full bed of 6 appliances.
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