Well, to start I am just getting into ecomodding! I recently bought a scangauge 2 off ebay. and have been messing with that. which brings up a few questions.
my first question is after I fueled and went into the menu to do the fillup. set the fill up to 100% the scangauge MPG information drops considerably. my car will show that is getting between 11 to 20 mpg avg. if I reset it, put all the info in and do not touch the fill up option it shows 27 - 40 avg which is about right for my car. (02 dodge neon sohc)
my other question, and this may be caused by the above problem is when I drove and kept the mpg numbers high on the scangauge I had actually lost about 4 mpg at the next fill up.
After rereading your post I was confused by what you meant when saying "set the fill up to 100%." When updating your SGII you should be updating your gallon fill total by actual gallons and not by percent filled.
Example: Using the side buttons to adjust the fill amount to 10.2 gallons if that's what you put in the tank. Not adjusting the percent numbers to 100% if you completely filled the tank.
The calibration of your scanguage is a work in progress before your first fill up. Usually after a fill up or two you will have adjusted your gallon fill numbers enough to be close to your actual mpg (and when you fill up again and again you should not be far off from what the SGII screen says you filled up). There is a thread on this site where guys have posted their percent adjustment for specific vehicles which might help starting out if you want to do a search but once you have a couple fill ups you should be close to your actual fill mpg.
If you're still way off after a couple fill ups check your settings to make sure you have it set for the correct engine size, engine type, tank size, etc.
thanks for the help. I have the engine size, type and tank size set. I tried setting it to 10 gallons at the fill up and it read like 130% full and the mileage shown was single digit. when i only shown it filled to 100% full (at 5 or 6 gallons) the mpg was higher but still very low for my car. but i will continue to use it with what you have told me.
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