I am looking for my wife a newer car and have considered some that clearly say only use Premium gas. Will the low grade gas damage anything in the car? I have just always considered the higher grade gas a waste of money. Is there any proof that the car runs better on the premium or will get damag…

[image] shadowfax: I fail to understand why someone would buy a luxury car and then be too cheap to put the required gas in it. If you don’t like filling with premium, get a car that doesn’t require it. I agree with you, but at the same time I am sure that there are a whole lot of people who …

[image] anon86613489: That’s steep, but why the big diff. USA versus Europe? The differential might be related to the length of supply lines. Where transportation costs are high, the difference might be larger.

[image] MikeInNH: There’s a large portion of the population who buy higher octane because of marketing. A fleet mechanic I used to work with was a part of that population. Nothing I could say would change his mind.

I remember when regular was 25¢ a gallon and premium was 29¢ a gallon. Now if regular is $2 50 a gallon which is 10 times the mid 1950s price, doesn’t it seem logical that premium would be $2.90 or 40¢ a gallon more than regular? I liked the Sunoco blending pumps back in the 1960s and 1970s. My R…

[image] Triedaq: I could save 2¢ a gallon over regular. And 2 cents was a lot more money in those days. I made $8500 a year in my first job, starting in 1974. My mom made a grand more, and I used to tease her about it. When I exceeded her annual pay a couple of years later, I really layed it …

@jtsanders My dad was teaching in a state college in 1938. His salary was $2500 a year. He hadn’t earned his doctorate at the time. He bought a new Chevrolet for $625 about 1/4 of his salary. I started teaching at a state university in 1965. I didn’t have my doctorate at the time. My salary w…

Our gas prices here ar in the mid to High $2.40s for reg. The main store my wife grocery shops at give gas points for how much you buy in groceries, we usually get 40 to 60 cents a gallon off and you can buy 25 gallons. So we save $10 to $15 each time. Modern cars that on;y require regular don;t g…

The reason they say premium gas only is that the engine is going to detonate with lower octane grade of fuel. Detonation is destructive of high compression engines. It burns valves, piston heads, head ports, etc. i.e. anything that is exposed to heat of combustion. Detonation is explosion rather …

[image] researcher: The reason they say premium gas only is that the engine is going to detonate with lower octane grade of fuel. Detonation is destructive of high compression engines. It burns valves, piston heads, head ports, etc. Are you finding this to still be a problem? It has been twen…

Cars that say premium gas only, what happens if you don't use premium gas?

Maintenance/Repairs

Dakotaboy February 28, 2019, 2:11am 153

Just to put in my 10 cents worth, my 2015 Jeep Cherokee 3.2 V6 has a compression ration of 11.7:1 and the owner’s manual specifies 89 Octane. I actually posted a question (FUEL OCTANE, GENERAL DISCUSSION) here asking if the fact that I had been using 87 octane fuel was causing a problem. The consensus was that it was not.

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Cars that say premium gas only, what happens if you don't use premium gas?

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