I've finally put 2 full tanks through my Max after having it almost 4 months. (I don't drive it much).

I've noticed that the dte seems to be about right, but the avg MPG in the cluster reads 5 mpg high. Here I drove mostly hwy this past tank and only pulled 26 mpg 'calculated' and the cluster said 31.5. It has done this the past two tanks.

Is this common?

I have put a new fuel filter in halfway through this last tank and my fuel gauge still reads ok.

 

Yes this is common. The mpg calculator on the cluster is useless. And If you don't reset it every fillup its even worse. Best way to calculate mpg or l/100 where I'm from is every fillup.

 

Ok. I didn't know if it was just my car or not.

I use Fuelly to keep track of all my vehicles.

 

Mine reads between 34 and 37MPG.

 

I think they all do it. Mine is between 3 and 4 MPG high and I've never heard of one being accurate.

It seems to be consistent so just subtract what it's off by and it's fine. If there's a change in MPG that might signal an issue you'll still notice.

 

Haha that's funny mine was telling me 91.7 mpg last nigh.

 

I think it is a common issue too. It reads too high.

 

Mine tells me 19-22MPG and it seems about right to me.

 

In the end, just do it the old fashioned way. Much more accurate.

 

I just use mine to try to drive with better fuel economy on long trips. I know it is inaccurate; however if you reset it after you fill-up and leave it on mpg, I think it helps you lay off that gas pedal. This weekend mine was reading 34-35 for a whole vacation trip with the trunk loaded, kids and wife, full gas, and heavy *** 350z 18's.

 

With my 440's, my DTE shows 480, and my MPG's are usually in the upper 30s'.

Last tank was 24.67 MPG actual.

 

it isn't very accurate