[fritz]

Hi folks,
I'll reply to this one and then go back to lurking. Afterall this site is for the pros and I belong with the amateurs at gassavers.org

"Simple right ? Yah, but apparently not too accuarate, since the pump sometimes shuts off before the tank is really full.
To account for this, in the past I have filled the tank to the point where that it spills over. This way I know that the tank is truly full.

There has to be a better way" .

Set the kms to 1/2 miles and the fuel used to quarts and then just double the kmh number to get your MPG

This will take a while but it's what I did with my supermid.

Record a few tanks usage, miles gone, supermid gas usage, and supermid KMs gone. The longer you wait the more accurate your result will be.

I adjusted the litres used to quarts used

Use yoshis formula, if you want to stick with litres use 3.8 instead of 4 in the formula

New fuel paramater = (supermid total fuel usage/(total gallons used*4))*old fuel parameter

This will adjust the supermid fuel usage to quarts

Next step adjust the distance. If you adjust the KMs accuratly you will end up having to multiply the KM/Quarts by a factor of about 2.5 to get MPG as in

MPG=KM/Quart*2.35*(4.0/3.8) or MPG = KM/Quart*2.47
2.35 for conversion from KM/L to MPG 4.0/3.8 from L to Quarts

If you left the setting in litres it would be MPG=KM/L*2.35

So if you want to bother doing tough multiplication in your head you use yoshi's formula

New distance parameter=((total miles traveled from odometer*1.61)/old displayed distance)*old distance parameter

If you want to do it like me a not worry about displayed KMs on the supermid you fudge the distance parameter to make 1KM/L displayed= 2MPG. So if the mid says 25 KM/L you are getting 50MPG

New distance parameter=((total miles traveled from odometer*1.61)/old displayed distance)*Old parameter*(2.47/2)

The last number being a conversion factor to make the KMs traveled off by enough to make the display correct for miles per 1/2 gallon

good luck. If your numbers are way off you will be pushing that little button a lot of times