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abacusnw · 07-10-2007, 08:51 PM

When I fill the tank and drive on the highway at consistant speeds via the cruise control, I get 32 MPH. BUT - when my tank goes down to less then half, the milage drops to 26-28. If I fill up before the tank goes below 1/2 I can get 32 MPH for as long as I keep the gauge over 1/2.

I am reading the milage off of my trip odom and using the fuel pump to meter a full tank until the nozzle goes auto off.

This is a consistant and repeatable event. Confuses the hell out of me.

07-10-2007, 08:51 PM	#16
abacusnw Registered User Join Date: Apr 2007 Location: Issaquah, Washington Posts: 5	2001 w/Tiptronic When I fill the tank and drive on the highway at consistant speeds via the cruise control, I get 32 MPH. BUT - when my tank goes down to less then half, the milage drops to 26-28. If I fill up before the tank goes below 1/2 I can get 32 MPH for as long as I keep the gauge over 1/2. I am reading the milage off of my trip odom and using the fuel pump to meter a full tank until the nozzle goes auto off. This is a consistant and repeatable event. Confuses the hell out of me.