Roof top tent mounting heights vs MPG

Below cab height is the way to go. Way better than my old setup that sat 6 inches above the cab.

 

a 4-5 mpg hit is crazy. i mounted my tent in april/may of 2020.

everyone says they get a hit, but never post actual numbers

i do need to update my table. been awhile since i entered some numbers

 

updated table if anyone cares. tent stays on year round. everything else is stock. bought the truck new in 2019 when the graph starts. 14 miles on it when i bought it.