Does a higher grade of gas give more mpg and what are the best brands?

Answer 1

There is only one grade of gas in America and that is "good".
All gas has to meet the API , and government standards.
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You may be mistaking the octane rating for a grade.
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The octane rating concerns how fast the fuel burns in your engine and was determined by the engine manufacturer.
Using the wrong specified grade will lower your mileage and cause harm to your motor, such as burned valves, bent connecting rods and holes in your pistons.
Remember- the higher the octane rating, the slower the gas burns, which is fine in high compression engines, but will ruin the average engine with a low compression ratio.
In order for the gas to burn completely and avoid air pollution, you want to only use the gas recommended.
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Answer 2

NO, Assuming you mean higher octane, regular 87 octane has the most energy per gallon. Additives which raise octane rating add no additional energy, they just slow down slightly the burn time to minimize PING in high compression engines. And High Compression engines get more horsepower by using more air and gasoline in the engine. You cannot get something for nothing!

All gasoline brands are alike in all the important specifications, everything else is advertising hype!

Answer 3

Higher octane gas usually has ethanol in it to up the octane level, ethanol does not give as good mileage as just gasoline that is why people question the use of ethanol for cars as it takes about as much energy to produce it as it gives out. If you ran just straight ethanol in a car it would get about one quarter less miles per gallon than a gallon of gasoline.

Answer 4

higher grade fuel only gives better economy if your car really needs the higher grade.

If you car can run fine on low grade then you won't notice any fuel economy change with higher octane. Octane is resistance to pre-ignition. It helps keep from damaging high compression engines or engines using turboschargers.

There's little to no difference between gasoline brands.

Answer 5

you should use whatever gas your owners manual says to use, that should give you the best gas milage, it's what your car engine was designed to run on! Higher octane gas might help if you only do short drives in your car, or if your owners manual recommends higher octane fuel. you might actually get worse gas mileage with the wrong kind of fuel.

Answer 6

To me it does, I only use Chevron. A lot of people say that it doesnt matter but some places water down their gas. It kinda depend on where you live as well. Here in Oregon, gas in general sucks...I personally would just try out different brands and see what works for your car.