So I installed a gen. in my truck a while ago.About two weeks.Anyway I left one post since.I had no gain in milage what so ever.Then the truck started to run really rough.Needless to say I was a more than discouraged.well come to find out the issue I was having had nothing to do with hho gen I installed.I found an ignition problem.Ordered a new HEI so we'll see what happens.I'm hopeful again.