Is Premium gasoline/petrol better?

"Zipppy, Mazdurp builder, Probeski owner and former ricerboy" (zipppyart) 07/27/2014 at 13:43 • Filed to: None

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I want your input just to get a discussion going.

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HammerheadFistpunch > Zipppy, Mazdurp builder, Probeski owner and former ricerboy 07/27/2014 at 13:58

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my dad was an engineer for chevron for a number of years and im pretty confident the rule for premium fuels is this:

Does your car knock on regular or mid grade? Use premium

Does your manufacture require you to use premium? Use premium

Any other case. Nope, best case you are wasting your money, worse case you will get leas mileage since your fuel requires more energy to ignite.

As far as the idea of more detergents and cleansers? Some brands maybe, chevron/texico as well as other major brands will use the same amount of their detergents. Your best bet if you care about the quality of the gas you put in your car is to stay away from store and discount brands, the quality of the stock is actually lesser (why do you think its cheaper?)

Zipppy, Mazdurp builder, Probeski owner and former ricerboy > HammerheadFistpunch 07/27/2014 at 14:08

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A former classmate of mine complained of bad mileage (300 km/tank) with his mother's Acura RL, which recommended 91 octane, he told me he ran 87 in it, and it wasn't knocking. after coming up blank with a professional scan tool and checking the usual culprits, he determined it was the fuel he was running in it. He said it got better mileage after putting the proper gas in it.

HammerheadFistpunch > Zipppy, Mazdurp builder, Probeski owner and former ricerboy 07/27/2014 at 14:11

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its variable and complex but depending on the condidtions (air temp, density, load, engine condition) this could very well be the case. We had a supercharged 454 that ran better in the winter on regular but had to have premium in the summer

BlazinAce - Doctor of Internal Combustion > HammerheadFistpunch 07/27/2014 at 14:53

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This. My Tipo is originally rated for 87, and that's what I'd use if we hadn't increased compression back in 2006. Now it knocks on 87, but runs fine on 100. Mileage didn't show any noticeable changes, but I'm afraid the people at the garage I rent are stealing gas...

tromoly > Zipppy, Mazdurp builder, Probeski owner and former ricerboy 07/27/2014 at 14:59

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Engines are designed using a specific fuel energy rating, if the manufacturer says to use a higher octane it's because the engine was designed to use the higher octane fuel from the start. While it may not knock, the computer has to switch to a less-than-optimal fuel mapping in order to use lower octane fuel, in a way it thinks the fuel is not being utilized correctly and pumps more into the engine to get the levels it's designed to see, resulting in worse fuel economy.

ranwhenparked > Zipppy, Mazdurp builder, Probeski owner and former ricerboy 07/27/2014 at 15:24

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Some cars run like crap without it, but if the car is designed for 87 octane and says so right in the manual, there's really no reason at all for running super unleaded.