[bestclimb]

Originally Posted by stovie

21mpg to 28mpg/24 gallon tank to 680 miles!!! i'm 3/8's the way through a tank and i have 320 miles

i know it sounds ridiculous but i'm getting that fuel economy and i'm not doing anything else but acetone it does drop the FE quit a bit driving on the highway though cause i have to stay at a TP that has to low a vacuum to work efficiently

Judging by the fuel gauge is a sure way to see whacked out data. Extrapolating from gauge position is an excellent way to exacerbate that whacked data.

Case in point

In my civic I have a 11.9 gallon tank. I can go 150 miles at 50mpg before it drops off of the full peg (that's 3 gallons used gauged by an MPGuino). If I use an extra gallon to go to 200 miles it drops to just above the 3/4 mark. If I look at the fuel gauge at that point it looks like I have used only a quarter tank on the gauge which is just shy of 3 gallons. 200 miles by 3 gallons is 66MPG that is about a 15 mpg error if I go by the gauge.

Moral of the story is get an average of a couple tanks with the mod and without as a bare minimum for getting an estimate of the effectiveness of your mod. It would be better if you could eliminate the variables of changing driving conditions but we know that it is not always possible when testing a mod for your self. Gauges are indicators, right now you have an indication of a great boost in mileage we are looking forward to some real data. Don't forget to include the fuel you are sucking in the vacuum lines in your total fuel for the tank.