is there really any difference in the types of gas (gasoline)available(USA)super,medium,and regular?

The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like “regular” 87-octane gasoline) can handle the least amount of compression before igniting.

The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a “high-performance engine” has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight — that is what makes the engine “high performance.” The disadvantage is that the gasoline for your engine costs more.

The more expensive petrols usually have superior cleaning chemicals to stop carbon build-up on the spark plugs. They might also have slightly lower levels of sulphur, a pollutant. Higher octane petrol only helps if you tune your car to inject less petrol in each stroke, but some modern cars can do this automatically.

YES /GAS IS LIKE BREWING WINE OR BEER/THE FRIST TAP IS ALWAY BETTER

The premium gasoline is better for your vechicle since it does keep the fuel system cleaner…but as for better gas mileage, there is a small difference but not enough to save a substantial amount of money. Now the grade with 10%ethanol does burn cleaner reducing emissions but actually has somewhat worse gas mileage than that of regular 87 octane. I would recommend running 87 octane unless your vehicle maker specifies otherwise

I answered this elsewhere here. Some higher octane fuels contain higher levels of detergent additives compared to the regular grades.

Depending on your car, you may or may not see better fuel economy.

Regarding gasoline brands, for the most part, gasoline is gasoline and what makes it Shell or BP or Philips 66 is the additives. In fact, the same refinery may provide all your local name brands and no-name fuels, simply adding the additives before trucking the fuel to your local station.

So, for the most part, gas is gas.

If you check the EPA website, you will see that there are dozens of EPA mandated fuel formulas for various areas of the US. This, as well as local tax policies, accounts for the wide variety of fuel prices. (I.E. why gas is so much more expensive in LA than it is in Atlanta or Oklahoma City.)

Using fuel from a station that has a lot of business is probably the best way to ensure you are getting quality fresh fuel for your vehicle. I would run the lowest octane fuel that prevents knock and ping.

HTH

they are ALL junk

Ther is a difference in fuels however most people dont drive ferrari’s. Most vehicles made (with the exeption of a few) are built to run on regular fuel. When you put premium fuel into a car that is meant to run regular you get absolutely no benifit. If anything you will loose. Consult your owners manual