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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Just a thought. My V10 mileage went in the toilet...cut in half...7 to 3.5. Took it to a chap and he said: "Front O2 sensor". When they go bad, they keep "asking" for fuel long after it is needed. Changed the O2 sensor and mileage is back to 7.
