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Quickurt · 05-11-2008, 05:52 AM

I haven't, nor expect to, try this on my Boxster, as it is not a daily driver, I don't care what the gas costs. If I can't afford the premium, the car stays in the garage, but then again, maybe we'd just skip the evening out meal that costs a fill up of premium anyway.
But I digress.
I burn nearly three tanks per week in my daily driver, due to commute distance. It is a CX7 Mazda with 2.3 Turbo engine, 6 spd auto, FWD. Because of fill up frequency I think I rule out most of the questions regarding the previous post on 10 tanks, 10 tanks of premium/mid grade.
I have found very similar results on my CX7, doing 2 weeks of mid grade and back to two weeks of premium. 1125 miles of mid grade - 19.87 MPG, avg. $3.22- $0.1621 per mile. 1141 miles of premium - 21. 22 MPG, avg $3.32 - $0.1565 per mile. NOTE: less than 1 cent per mile difference!!
Again, this is NOT a Porsche, but verifies the previous test in a BMW, so it stands to reason it will also be so in the Porsche, to a similar degree.
Add to this, the car is SUPPOSED to get premium gas. Does it make sense to risk damage to your VERY expensive Porsche engine to THINK you're saving a couple of bucks, when, in fact, you are probably losing money on the proposition?

05-11-2008, 05:52 AM	#22
Quickurt Registered User Join Date: Jul 2007 Location: Coastal Oak Forest Posts: 1,069	I haven't, nor expect to, try this on my Boxster, as it is not a daily driver, I don't care what the gas costs. If I can't afford the premium, the car stays in the garage, but then again, maybe we'd just skip the evening out meal that costs a fill up of premium anyway. But I digress. I burn nearly three tanks per week in my daily driver, due to commute distance. It is a CX7 Mazda with 2.3 Turbo engine, 6 spd auto, FWD. Because of fill up frequency I think I rule out most of the questions regarding the previous post on 10 tanks, 10 tanks of premium/mid grade. I have found very similar results on my CX7, doing 2 weeks of mid grade and back to two weeks of premium. 1125 miles of mid grade - 19.87 MPG, avg. $3.22- $0.1621 per mile. 1141 miles of premium - 21. 22 MPG, avg $3.32 - $0.1565 per mile. NOTE: less than 1 cent per mile difference!! Again, this is NOT a Porsche, but verifies the previous test in a BMW, so it stands to reason it will also be so in the Porsche, to a similar degree. Add to this, the car is SUPPOSED to get premium gas. Does it make sense to risk damage to your VERY expensive Porsche engine to THINK you're saving a couple of bucks, when, in fact, you are probably losing money on the proposition? __________________ Sold - Black on Sand Beige 2006 S - 48K miles 18x8.5 and 10 OZ Alleggerita HLT Anthracite wheels and anthracite Cayman side grilles - lovingly adjusted Schnell Short Shift