I think you need be a little more specific. Because driving 100% highway and driving 100% city is going to give you two very different results.
For example, most of my driving is 70/30 city/high and I get about 300 miles on a tank, but when it is 50/50 I get 270 miles. Plus, you have to consider whether it's a 2.5L a 3.2L, etc.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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