Boxster's this much of a gas eater?

[OldBlevins]

Amen to checking it with a refill. On the highway, I get 26 - 29 mpg, but the first quarter of a tank the gauge drops like a buick pushed off a cliff. It was a little alarming to me till I figured out it was just the gauge. Dunno if that's typical of the Boxsters....

[JackG]

Originally Posted by OldBlevins

Amen to checking it with a refill. On the highway, I get 26 - 29 mpg, but the first quarter of a tank the gauge drops like a buick pushed off a cliff. It was a little alarming to me till I figured out it was just the gauge. Dunno if that's typical of the Boxsters....

Same with mine. It never quite hits the full mark, and it's down to 3/4 before you can say "New rear tires, please".
The trip from there to 1/4 is much slower.

[David N.]

Bad MAF or O2 sensors could also lead to running richer and less efficiently. Just a thought...

-David