Gas mileage
12-02-2014, 01:38 PM
#21
AudiWorld Expert
Less power? Did you mean less energy content? What's the source of this info? AFAIK, the octane rating is not an indicator of energy content, and both regular and premium grades have about the same energy content...
Regular Versus Premium Gasoline
Regular Versus Premium Gasoline
12-02-2014, 01:51 PM
#22
AudiWorld Super User
"Less power? Did you mean less energy content?"
Yes.
" What's the source of this info?"
A fellow who was the dean of a university's School of Advanced Technology. Who also held two PHD's from the Swiss Federal Institute (aka the MIT of Switzerland) and was a professional combustion engineer with his patents licensed and that equipment installed on 90% of the world's diesel locomotives at the time.
Professional credentials as one of the leading combustion engineers on the planet at that time.
Anyone can confirm the facts, just by road testing different fuels. They're not all the same, even if many are very similar. Of course, you'll need to do some math and run the tank nearly empty, and then fill it refill it again at least once or twice, to make sure you are really running over 90% of whatever fuel you've just put in.
This is like the racket to sell nitrogen fills for tires at $45 a pop. The nitrogen extractor pulls it from the air, incredibly cheap. The air itself is about 79% inert gasses, 78% nitrogen, and supposedly oxygen molecules leak out through the rubber faster than nitrogen does. So...after you've refilled the tires with "air" a few times? Right, they're pretty much nitrogen filled anyhow. Combat aircraft and race cars are a whole other story.(G)
A LOT depends on how the engine is set up, whether you can change that, and these days, with a flex-fuel ECU that has a very wide operating range? That's donkey work, and the donkey (dumb computer) does it very well.
If you're tromping on the wrong pedal all day and making high demands on a high compression engine boost, that's the only case for premium. They all burn just as clean, if you're using the same fuel supplier.
Yes.
" What's the source of this info?"
A fellow who was the dean of a university's School of Advanced Technology. Who also held two PHD's from the Swiss Federal Institute (aka the MIT of Switzerland) and was a professional combustion engineer with his patents licensed and that equipment installed on 90% of the world's diesel locomotives at the time.
Professional credentials as one of the leading combustion engineers on the planet at that time.
Anyone can confirm the facts, just by road testing different fuels. They're not all the same, even if many are very similar. Of course, you'll need to do some math and run the tank nearly empty, and then fill it refill it again at least once or twice, to make sure you are really running over 90% of whatever fuel you've just put in.
This is like the racket to sell nitrogen fills for tires at $45 a pop. The nitrogen extractor pulls it from the air, incredibly cheap. The air itself is about 79% inert gasses, 78% nitrogen, and supposedly oxygen molecules leak out through the rubber faster than nitrogen does. So...after you've refilled the tires with "air" a few times? Right, they're pretty much nitrogen filled anyhow. Combat aircraft and race cars are a whole other story.(G)
A LOT depends on how the engine is set up, whether you can change that, and these days, with a flex-fuel ECU that has a very wide operating range? That's donkey work, and the donkey (dumb computer) does it very well.
If you're tromping on the wrong pedal all day and making high demands on a high compression engine boost, that's the only case for premium. They all burn just as clean, if you're using the same fuel supplier.
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