I read about MPGuino but can't even find how much one costs... out of 2 tanks so far the fuel economy after watching the vacuum gauge has increased 2 and 3MPG respectively. I haven't come up with enough data to get an accurate average gain yet. I would like to try to get at least 3 or 4 tanks before calculating an average gain.
I also try to go at least 300 kilometers before filling. I know the fewer gallons put in the more error in the calculations.
