Average mpg readout

Do you think that those electronic avg mpg fuel readouts are accurate?

 

Depends on what it is you're using. If you properly calibrate something like an Ultragauge, then yes, it will be accurate.

 

On my ecoboost it was fairly accurate, I'd say within 3%, when I had a silverado.. fuck no, I could granny it a whole tank, it would claim 30+ mpg but realistically it was around 14.

 

I'm using what came with the wifes civic. I guess I will have to compare that thing with what I actually come up with on pen and paper.

 

Let us know what you find out. On other forums I have seen guys brag about what their readouts say, but never how they compare with real life calculations.

 

My wife's 4runner has a built in one and it is off by a couple mpgs. It still tells you how you are driving, but it is consistently high. I just subtract a couple mpg and it is usually close.

 

I did notice one thing when we first got it the mpg was around 36 We got the first 2 oil changes free where we bought it then the MPG's dropped to around 35 / 35.5 We just took it to a local guy who put mobile one in it and it is back up to 36+ I think the dealer screwed us and didn't put in full synthetic even though that is what it is called for in that engine. I'd do it myself but can't fit under it ....was thinking of ramps but I think the drain plug is towards the front.