Workhorse 8.1 liter poor fuel mileage
I have a 2005 Fleetwood Southwind 37c with the 8100 Vortec V8 with an Allison 5 speed transmission with 28000 miles that gets very poor gas mileage, about 6 mpg towing my boat or pickup and 7 mpg empt...
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8.1 in small class a towing 8.5 x 20 enclosed trlr with same Banks stuff and same results as you including black exhaust. I have been as low as 4mpg
