I've found a site with reviewing performance chips and helped me to make the right decision. I have the Stage 1 Chip for Mi MH and I see more power and better mileage. here it's a link where you can see the reviews: ***Link Removed***
Give it a try. I have installed a Stage 1 Chip on my MH and I'm sure it's doing 3-4 MPG. These chips need to be programmed for your MH in order to work. What I did, I have sent a message to their website and they programmed the Chip for my MH. I'll p...