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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The terrain is both mountains and flatlands, but it seems there are always hills wherever you go. It got the same mileage stock before I changed anything, although I don't remember if the tailpipe had the black soot in it. I'm thinking of taking it to Banks and have them put it on the dyno and see what they say.
