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ya GM's vehicles, especially the V8's I have seen tend to get better mileage once you get around 10k mile mark. Most recent example..My dad bought a new 08 Silverado last September and we ended up driving cross country with it shortly after (maybe 2-3k miles only on the truck) and we averaged around 18mpg, and he does a fair amount of 300+mile trips once or twice a week ussually and was getting 18mpg on average for those as well.
I was talking with him the other day and he said on his hwy trips he is NOW averaging 20-21mpg (I am guessing he has around 10k miles on the truck now). That truck also has the AFM on it as well.
Give it time, she will do better, I am even going to say I gaurantee it!
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2002 Bonneville SLE
Zaino Treated, 6000k HID's, 25% Tint, Red Painted Calipers, Vent Visors, LED Conversion
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