ELM 327 & app to read MPG

[gchemist]

I recorded a few more screen shots from the Jimmy. Unforunately, I just retired it at 236651 miles. Based on my history info on average MPG, it was close. Now, I'm using the ELM326 on my '08 Nitro. It has input from the fuel gauge. My first fill up didn't get a reading of 100%. I read up only 90%. I have to fill it up again and check it. As I was going down the road, the % of fuel in tank was going up. It kept going until I received a phone call which shut off the signal. It was close enough that I could trust info. I need several long trips to estimate if miles to empty is accurate enough. I may need to play around with correction factors to make it more accurate.