Why doesn't everyone drive a Boxster?

[Perfectlap]

Originally Posted by 986_inquiry

Escalade gets 18mpg highway driving cross-country if you fill up, immediately get on the highway, cruise at 60 mph for 400 miles, get off highway and fill up again. By that comparison we get 30mpg

I live within arm's reach of two major highways and I routinely drive to the other side of state (non-rush hour) to visit friends who also live within blocks off the parkway. I'd say very little of my driving doesn't occurr on the ultra smooth GSP on non-peak hours.
On full tanks and in nearly 8 years of owning this car I have NEVER been anywhere close to 30 mpg. I say I am lucky to even hit 23 mpg (all) highway and that's very smooth throttle, barely tapping the brake, on low revs which isn't at all good for the engine.