What do you think? Is premium a ploy designed to add to Big Oil coffers? Or, do you think it’s a “must” for all high-compression engines, no matter what we said? Want to chime in with a second opinion on something else we said? (It wouldn’t be the first time. But you probably already kno…

ive had some vehicles that wouldnt run right on anything less and some that only run right on reg,depends on the vehicle.so their is a difference.

It all depends on the car. Read the owner’s manual to find out what you should use. If the manual specifies premium only, don’t use anything less. (In an emergency, you can put in a little bit of regular just to get to the nearest station that sells premium.) If the manual recommends premium, but …

The reason many cars use premium is for higher performance. Putting regular in a car that calls for premium is the wrong answer. You may damage the engine and will certainly loose performance. The right answer to save money is to look for a car that runs on regular like a Honda Fit our most non-per…

My pet peeve is that the octane level of regular, mid and premium varies from state to state. My owner’s manual says to use 86 octane gas. In Colorado where I live, regular is 85 so I have to buy mid-grade which is 87. In Michigan, where I grew up, Regular is 86 so I could use regular if I lived the…

Dear Sir, ALL cars built for sale in the U.S. Have had some form of “ignition retard” and have since the 1990’s. Some as early as the early 1980’s. (Even Chrysler K-Cars!) Check it out!

O.K. Start by takeing any basic automotive engine course and pay a lot of attention to the parts that talk about compression, power, timing advace, and detonation. Then try rewriting this little fable of ypurs.

I own a 2006 Mini Cooper with an automatic transmission. I tried a full tank of 87 octane instead of the recommended 91 octane. The car turned into a SLUG. The car has only 116 horses to start with and it seemed like it lost 40% of the power! After two tanks of Premium 91 octane, the power came …

The reason many cars use premium is for higher performance. Note to cclarify: Car manufacturers make high performance engines usually by increasing the compression and that in turn requires high octane or retarded timing which would eliminate the performance advantage. So just to clarify things,…

As I’m sure others will bring up, altitude also affects octane requirements of your engine. At a higher altitude, air is thinner, so you pack less of it into your cylinders, effectively resulting in a lower compression ratio. As a result, your engine’s octane requirement is lower at higher elevati…

Premium versus Regular

The Show

Joseph_E_Meehan July 31, 2007, 6:36pm 10

Don’t forget that there are two methods of measuring octane and they don’t give the same numbers. Generally in the US the posted number is the simple average of the two methods.

Topic		Replies	Views
Premium vs. Regular Gasoline Power/Fuel gasoline , cadillac , deville	37	3089	May 13, 2010
A New Analysis of Premium vs. Regular Power/Fuel gasoline	49	11107	November 19, 2016
Cars that say premium gas only, what happens if you don't use premium gas? Maintenance/Repairs	174	28157	March 7, 2019
Premium Vs. Regular grade Gasoline debate Maintenance/Repairs	19	1726	August 27, 2008
Gasoline Usage Power/Fuel gasoline , mercedes-benz , glk-class	23	2952	August 11, 2010

Premium versus Regular

Related topics