Don, your last two tanks seem to be the exception to the rule. Everything added up with regards to the tank size, so nothing changed there. Where you may get into trouble is the reason for this thread. This vapor space can add to the amount of gas you pump if the right front of the FEH is on a slope down. There are also times when the left rear is on a slope down, and you will not pump 15 gallon total in the tank. GPSman1 stated you can put 12-17 gallons in an empty tank, but I think 12 gallons is to much on the low side myself because I've never had that happen. Because my fill-ups very so much, I'm going to continue with no adjustment there. Besides, the dash MTE lets me know how much gas I have in the tank because I'm sure there is 1.3 gallons after 0 MTE in my FEH.

I haven't calibrated my speed, and this may be where I getting less trip miles than the dash. Thanks for that tip!

GaryG

 

Around here we have some radar signs that post "your" speed as you pass the speed limit sign. The digital radar speed always matches my SG speed.

The dash needle always reads about 2 MPH high.
I hit 40 MPH when the entire width of the needle has past the 40 MPH mark, and I can see the 40 MPH mark to the left of the needle.

I think this is true for most cars.
I also think this is why some people say they can go 42 MPH in EV.
We all know this is not the case!
Just something to keep in mind.
( and GPS is not accurate for land speed if you are on a curve or hill, of course. )