Fuel Gauge inaccurate calculation issues
 

I bought my wife a 2020 Sport HST. It is suppose to have a 27.5 gallon capacity fuel tank. I have never put more than 21 gallons into the vehicle to fill it up. I recently filled it up with it showing 50 miles to empty with 19.8 gallons to fill the tank. The gauge shows after fill up 396 to empty, which calculates to 14.4 mpg. We have been averaging 19.5. Dealership could not find any issues. Anybody have a similar problem. Thanks!

I assume you bought it new?

For some reason I could not get back onto this forum. I had to sign up under another user name(I was Rombo). Anyway, my wife's HST is new. Delivered 9/3/19. We have almost 7,000 miles on it. NEVER put more that 21 gallons in this vehicle.

Well I asked about being new because while I dont know the HST at all my though was a re-badge. Only because some of the other Sports seem to come with a 22.7 gallon tank. And with what you describe, a face valve that seems to be the size of tank you have. There is no real easy way to verify the tank capacity unless a part number can be located on it or it can be filled and drained. If even possible, I wonder if the wrong size tank was installed on the line. There is clearly an issue though.

I thought about the 22.7 gallon fuel tank size as well. Dealership and RR North America both confirm 27.55 gallon tank is on our vehicle. It's very frustrating, the dealership is no help what so ever!

Have to try another dealer. Thats just too much of a capacity different between being empty and filling up. My LR3 is off by about a gallon, which is expected for reserve. But you are off by several. I assume you have repeated the exercise of the gauge reading out and filling up a few times? I would bring it to the dealer at empty and have them fill it themselves to confirm themselves.

Thanks, that was going to be my next move. A little frustrating nevertheless....

I just purchased my 2020 HST recently. When I fill up, it reads around 500+ miles till empty when I fill up. btw what area are you in?

I live in the Pittsburgh area

Fuel capacity issue
 

I have a 2021 HST. Paid 100k. I have the same fuel capacity issues. Says 400 miles on full tank.
for this amount of money it has to be right. I’m going to sue the dealer for misrepresenting the vehicle and inducing me to buy it with false information.