OK braniacs help me out here. I have a 1998 GMC diesel turbo and pull a 7000lb trailer. i have 5 of the gas maker Tn hho units connected and a MAP enhancer on my turbo sensor with a Scan Gauge. Pulls about 25-30amps but I don't see much of an improvement in mileage,maybe 1/2 mpg if any. And when I use the MAP enhancer the Scan gauge shows that the mileage goes down at least 2mpg. So does the HHO only work on light cars that aren't under a load all the time? It looks like i'm wasting my time and money trying to make this work in a towing scenerio. Any thoughts would be appreciated.