I've been using the truck mount to clean a lot of upholstery lately but just thinking today, as I clean another sectional sofa, "what the hell am I doing"? Here I have my truck mount running burning maybe 1.5 gallons per hour, I've turned down the pressure and and am using the vacuum brake on the upholstery tool. I have portables that will produce the same results with inline heaters and I can use the customers electricity. With gas hovering between $6-8 per gallon, this last job cost me $10 more than if I used a porty. If I just do even 5 jobs a week like that, that's an extra $50 a week. That's like 10 baconators.