Just had my fifth fill-up and my first 700 mile tank.

The guages, meters in the NAH are hopelessly inaccurate.

As in the previous post, I always use the same pump in the same gas
station with auto shutoff and fill only on tank empty.

It was 701 miles for 18.8 gallons for real mpg of 37.3.

The mpg meter in dash showed 39.7. This +2.5 mpg is a constant
error for every tank.

I drove 100 miles after the range in the dash showed --- and still
there was 1.2 gallons left in the tank. I do not know what is the use
of such a range calculator. They can as well warn at half tank.

The range also suddenly drops from around 30, 35 miles to ---. Dont
they even know how to count down to 0 ?

I figured when range goes to zero it uses around 16 gallons with 4
gallons left in the tank. If I add the 30,35 miles that it showed before
it droped to ---, then at that point around 17 gallons are consumed.

After that driving another 70 miles is safe provided your driving style
remains the same and the mpg meter in the dash continiues to be the
vicinity of the same value.

One more point, when the fuel guage shows half tank I complete 400
miles, then at 600 miles it gives tank empty warning. There should
be a limit to this non-linear behavior of the fuel guage, however inaccurate it might be.

Cannot seem to break out of the 37.x mpg. I think it is because of
my short commute of 20 mins. Drive is 80% city. Tire pressure is at
42 psi. Mileage of car is 3500. First oil change is done.

It takes me one month to empty a tank. This was my original goal which
I am almost achieving but would like very much to break the 40 mpg
barrier.