Truck w/ deflector (duct tape to fill cab to deflector gap) & fifth 18.4L/100
Glad you're on the way. A gasser has some problems to overcome versus a few of the early 2000's turbodiesel 1T trucks. Pulling all-aluminum aerodynamic travel trailers from 28' to 34' (8k to 12k weight), a fairly common number is 14.7L/100 on level Interstate (these are 55' to 63' combination rigs).
The best I've seen is reports in the low/mid 10's for Airstream trailers below 23' pulled by Euro TD SUV's.
You and KamperBob and Skyking are all up to some good work. The potential for a 5'er is definitely high, and, [my guess] that will eventually pull away on the lowest fuel burn numbers.
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