Gas gauge off by 1/4

Mullinax is probably right. An easy way to check the gauge function is to pull the wire off the gas tank sending unit. When unhooked the fuel gauge should peg all the way to the right. Then ground the wire and that should make it go to empty. If it does this the problem is with the sending unit. Get it up on a rack and they're not hard to get out. Just make sure you run the gas down low first.