My gauge won't go below full until about 4 gallons have been used, and won't hit half until I have just 6-7 gallons left. It'* been like this as long as I've had the car, and probably since new.

Is this a resistor under the rear seat fix or a new/adjusted sender fix?

I believe all of the 92-99 Bonnevilles do that, and I don't think there'* a fix. I think it has to do with the location of the sender and the shape of the gas tank.

As soon as I hit the highway mine quit doing it, it doesn't do it when the car isn't under forces. Do we have some sort of recourse to fix it?

Mine (9 doesn't do any of that.

I hate to say it, but it sounds like a sticky sensor

i'm with fuddy

Non linear calibration through the whole range of the fuel gage from full to empty.

I could fix this with a resistor, no? Find the proper resistance to lower the fuel sender output voltage (or raise, I don't know which way it goes).

I don't think that would work because you would need to add varying amounts of resistance depending on the gas level in the tank, because it is a non-linear function.

Is it possible to adjust the position of the sensor, then?

Are we all talking about the same thing? Mine says Full anytime I'm on the brakes... And less than empty when I make her loud....