Just wondering how accurate it is and if mine is acting wonky or not? If I let the car idle I can see the MPG go down every ten seconds or so. For instance today I let the car heat up for about ten minutes and saw my average went from 21 to 16. is this normal, or an indicator of a problem. I understand idling eats up MPG but to this extent?

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-Justin

I'd like to think it's just because your idling, although my mpg is 18.6 consistently

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2001 SLE tints | Series III L26 | 180 T-stat |

[b]2002 Monte carlo SS Dale Earnhardt edition (waiting on salvage title)

right, but it seems to be hyper sensitive literally has gone down to 12 MPG after idling for 15 or so minutes while I helped push someone out of a ditch. Is there a sensor that may be wonky or any advice or is this normal behavior or is it correct and a signal of a deeper issue at play? Thanks Gentlemen

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-Justin

As you can see in the video its quite dramatic...

https://www.facebook.com/photo.php?v=10 ... 5123695182

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-Justin

If you reset the fuel economy reading, then it will fluctuate more until you have driven 25-50 miles, then it should not change much when idling.

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bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)

The longer you drive on the average after you reset it the harder it will be to change due to it averaging more and more time, distance, and fuel burnt.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles