I have been using my SG2 since April, and have the guages read gph, rpm, mpg, and mph. For some strange reason the mpg shows 0.02 gallons / hour even without the engine "started"! I'm sure this affects the mpg readout. The mph reads 1 less than the dash, and is confirmed by stopwatch and mileposts. Does anyone have any insight into the errouneous gph reading? For what it's worth, it read 0.03 initially.
Tom

 

I emailed ScanGuage about this problem and got the following reply -
ScanGauge ✆ to me
show details Aug 9
Tom,
Unfornunately, Toyota reports a sensor about a fraction off and there is nothing that we can do to fix this matter.
Thank you,
Cristina Bollinger
Linear Logic, LLC
I guess that means "case closed" unless someone knows how to program an Xguage way around it....