Forum Discussion
wintersun
Aug 20, 2021Explorer II
I have driven as fast as 80 mph to get past a long line of tractor trailer rigs but otherwise keep my speed well below 70 mph. With a camper the truck is having to overcome air drag with increases exponentially with speed. At 80 MPH the air drag is 300% greater than at 40 mph.
With my own diesel pickup and a cabover camper the truck would average 13 mpg on the highway at 62-65 mph. With a 10 mph headwind I was in effect driving at 72 mph and the miles per gallon would decrease by 10%. If I was driving at 70 mph with a 10 mph headwind the truck would drop to 8-9 mpg and I was consuming 20% more diesel fuel and would need to make a fuel stop much sooner.
With my own diesel pickup and a cabover camper the truck would average 13 mpg on the highway at 62-65 mph. With a 10 mph headwind I was in effect driving at 72 mph and the miles per gallon would decrease by 10%. If I was driving at 70 mph with a 10 mph headwind the truck would drop to 8-9 mpg and I was consuming 20% more diesel fuel and would need to make a fuel stop much sooner.
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