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  #1  
Old 10-18-2005, 04:21 PM
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Premium...

Went on a 1200 mile road trip with a friend of mine, rented a Le Sebring Convertible. When my buddy filled up for the first time I noticed that he filled the tank with premium. I told him he was crazy to use premium in a rental car. His response was: better gas better milage, so saving money on the long run.

He drives some high end cars, so I can understand he uses premium for his own cars, but for a rental.

Is he right, or just a good consumer...
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Old 10-18-2005, 04:33 PM
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There are more than a few threads in the technical forums discussing grades of gasoline and octane readings. Better MPG? It depends on too many variable to just say that premium unleaded is better than regular unleaded.

The key element is the octane rating, which is currently an averaged number, representing the fuels resistance to detonation. The higher the rating, the more resistant the fuel is to premature combustion. Higher compression ratio engines do require higher octane fuels to avoid predetonation, or ping. Race fuel is in the triple digits. Modern cars have knock sensors (seismic devices) that can adjust the timing to eliminate or reduce predetonation, but do so with a loss in available HP. So in a modern car, using the proper octane for the car should get you better MPG, but putting premium in a car that doesn't need it would be a waste.
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Old 10-18-2005, 04:51 PM
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Quote:
Originally Posted by MTI
So in a modern car, using the proper octane for the car should get you better MPG, but putting premium in a car that doesn't need it would be a waste.
That's my conclusion, in a nutshell. The 190e got mid or premium; the Mustang does not. The VW bus gets it as it pre-detonates easily on warm days. The Jetta gets neither.
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Old 10-18-2005, 04:59 PM
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How about using premium to improve the smog numbers? Mine's coming up. Or even octane boost?
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Old 10-18-2005, 09:50 PM
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jim
just make sure to get her good and hot before you get to the shop.
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Old 10-19-2005, 01:42 AM
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Quote:
Originally Posted by Jim Anderson
How about using premium to improve the smog numbers? Mine's coming up. Or even octane boost?
Yep, good and hot is the way to go. You can loosen up the valves a little too. That seemed to help my old Isuzu trooper.
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Old 10-19-2005, 12:13 PM
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Quote:
Originally Posted by 123c
All gas powered turbo engines require Premium, or they don't run right...
I noticed that the fuel requirements for a 2000 Saab 9-5 Turbo V6 were only 89 Octane which is mid grade are around Milwaukee but it was run on regular to mid grade for 70k miles with no problems. Does anyone else have their turbo Saab run on regular or mid grade fuel?
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