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The Costco in my area sells Top Tier gasoline for prices that are competitive with most of the unbranded gasoline stations. Premium is $3.64 and Regular is $3.16 today. The $0.48 cost difference is typical, but it does vary.
The owner's manuals for my 2005 Mercedes C230 says Premium is required. I think the manual for my Boxster says the same thing. I expect both cars would run on Regular, but I also expect the fuel economy would decline. Based on this, I decided that saving a few dollars per fill by using Regular would not have a huge impact on overall operating costs.
Because German cars in general seem to be maintenance and repair intensive, I decided to eliminate a risk factor and pay extra for Premium fuel.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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