Slant Six Fuel Mileage?

Those new replacement sending units are off.....they read full when tank is full but go down faster than originals and read empty when there is still 5 gallon of gas in the car......As mentioned, best thing to do is math calculation to figure out MPG.....They also make a device that will correct the gauge measurements so they are accurate regardless what sending unit you have....see if I can find it...here is a good read

Solution to Fuel Gauge/Sender Problems
Man, thanks so much! I thought I was nuts! I mean I am getting older and I was thinking "Did I fill up yesterday or maybe a couple days ago?" The gauge did not work when I bought it so I thought "Well maybe I just did not pay attention to it for a couple of days and I ran the gas down!" I mean, hell if I don't take the cardboard center out of the empty roll of paper towels down the hallway with me I'll end up in the laundry room doing laundry instead of getting a new roll of paper towels for the kitchen!! LOL! Thanks for the guidance on my fuel gauge reading problem!

Mike