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I have an 03 Boxster I just bought, so I'm trying to get a handle on the mileage.
I have new Kumho all-seasons on the car, so I'm taking it easy for the first 1000 miles. In regular driving up to 3000 rpm, I'm getting 26-27 mpg overall mixed suburb/short trips and highway.
On a trip to the Poconos a couple of weeks ago, I got 35 mpg driving mostly at 55-65, top up, no AC, in the morning. I also drove about 1/3 of the trip with the top down, side windows up on secondary roads at 40-50 mph. Coming back, mostly downhill, I got 36.5 mpg., speed to 75 mph, mostly 55-65 mph, some AC. Once again, top down, windows up, on secondary roads, 40-50 mph, about 1/3 of the trip. The computer didn't show a lot of change on secondary roads, 33 mpg or so.
The computer agreed with the mpg number I calculated on fillup: total miles/gallons.
If you drive close to the speed limit and don't use the AC much, you should be able to get over 30 mpg on the highway. Around town, it depends on how many cold starts and short trips--also getting stuck in traffic. The computer says the low 20s under those conditions.
The on-board computer lets you monitor mpg continously, which helps to get good mileage.
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