'95 Dodge Caravan

Hey guys, First tank of gas showed a 40% increase. I have a 7 plate cell using potassium hydroxide as electro and a map sensor enhancer. last tank of gas showed no increase in mpg. I read in the water 4 gas manual that I could also mod the oxy sensor. It said that there is a potential that the oxy sensor will still richen the mix. Is this poss with the map enhancer? Anyone have ideas? Thanks.

I have been finding that when dealing with a vehicle with a map sensor, you have to enhance both the MAP and O2. The MAP will give you gains for a short while. Try doing both.