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Old 12-06-2012, 04:13 PM   #1
Registered User
Join Date: Nov 2007
Location: CA
Posts: 78
My Ride: 05 330 ZHP auto
MPG / fuel gauge inaccuracies - SULEV issues?

Ok, so there's some issues going on here that I started noticing a few weeks back.

1.) The fuel gauge is not accurate. It's a 16.# gallon tank, so each of the markers should roughly be at 1/1, 3/4, 1/2, 1/4, 0/0. I've always got about 300 miles out of 11.5 gallons (I always try and get gas at the 1/4 marker due to SULEV fuel system) but lately the tank has been going to about 1/8th to get to 300 miles.

If you see from the picture of the fuel pump, I used 12.75 gallons, which does not correctly match where the needle is on the fuel gauge. The final picture shows the fuel gauge showing a full tank after 12.75 gallons.

2.) Somewhere, something's not adding up. If you take 316 miles divided by 12.75 gallons, you get 24.78mpg and NOT the 26.7mpg that the computer shows.

I've ALWAYS been getting 26-28mpg and 300+ miles out of 12 gallons of fuel but now the numbers are not adding up in anyway.

Any ideas of what's going on?
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