luxury cars that use 87 octane gas image
riddelinpr
also, which gas stations are the best to buy from? I usually buy chevron or shell.
Answer
What you are reffering to is called the OCTANE a measure of the autoignition resistance of gasoline (petrol) and other fuels used in spark-ignition internal combustion engines.
Octane is measured on a scale of 0-100. In America, you are probably used to seeing 87 (regular) , 89 Premium and 93 Ultra.
These are just marketing terms used for people who are not educated about the gasoline refinery grades.
To make it simple for you, Octane ratings point to the amount of "knock" expected from the engine's burning of the fuel.
Engine knocking is compression detonation of fuel in the power stroke of the engine. Knocking occurs when the air-fuel mixture autoignites all at once (or sometimes perhaps when the flame front goes supersonic because of early ignition timing), before the flame front from spark plug ignition can reach it. The explosive reaction causes combustion to stop before the optimum timing, causing a decrease in performance. A fuel with a high autoignition temperature that burns reasonably fast and thus does not need early ignition timing will most often have high practical value knock resistance. Ethanol is such a fuel.
Basically the higher the octane, the lower the KNOCKING and the more combustible the fuel.
NEwer fuels such as ETHANOL E85 are composed of 85% Ethanol and 15% gasoline.
Ethanol which is an alcohol has higher octanes than similar gasolines, less knock and burns cleaner and cooler than gasoline BUT, since Ethanol is corrosive it damages car's fuel lines that can't resist its properties of corrosion.
That is why your current gasoline is only mixed with 10% ethanol rather than 85%. E85 is coming to most cities in the next 5 years.
Airplane fuel for military jets is of the highest octane because it must be volatile enough so that the engine won't "flame-out" in combat manuevers.
Some cars such as luxury sports cars and luxury SUV's require no less than 93 because they require a fuel that burns quickly, and in its entirety with no knock. Take for example a RR Phantom. If you use that car with 87 Octane, you will hear the engine knocking and eventually you will damage the engine.
Super Luxury cars such as the Bugatti Veyron require no less than 97 Octane (Racing Fuel) which costs $8 a gallon.
I'd say the best gaoline stations to buy from are BP, EXXON, SHELL, and HESS. These are well-known, trustable gasoline marketers who are more likely to sell you what you pay for than to try and rip you off by adding water to your gas or selling you false octanes.
What you are reffering to is called the OCTANE a measure of the autoignition resistance of gasoline (petrol) and other fuels used in spark-ignition internal combustion engines.
Octane is measured on a scale of 0-100. In America, you are probably used to seeing 87 (regular) , 89 Premium and 93 Ultra.
These are just marketing terms used for people who are not educated about the gasoline refinery grades.
To make it simple for you, Octane ratings point to the amount of "knock" expected from the engine's burning of the fuel.
Engine knocking is compression detonation of fuel in the power stroke of the engine. Knocking occurs when the air-fuel mixture autoignites all at once (or sometimes perhaps when the flame front goes supersonic because of early ignition timing), before the flame front from spark plug ignition can reach it. The explosive reaction causes combustion to stop before the optimum timing, causing a decrease in performance. A fuel with a high autoignition temperature that burns reasonably fast and thus does not need early ignition timing will most often have high practical value knock resistance. Ethanol is such a fuel.
Basically the higher the octane, the lower the KNOCKING and the more combustible the fuel.
NEwer fuels such as ETHANOL E85 are composed of 85% Ethanol and 15% gasoline.
Ethanol which is an alcohol has higher octanes than similar gasolines, less knock and burns cleaner and cooler than gasoline BUT, since Ethanol is corrosive it damages car's fuel lines that can't resist its properties of corrosion.
That is why your current gasoline is only mixed with 10% ethanol rather than 85%. E85 is coming to most cities in the next 5 years.
Airplane fuel for military jets is of the highest octane because it must be volatile enough so that the engine won't "flame-out" in combat manuevers.
Some cars such as luxury sports cars and luxury SUV's require no less than 93 because they require a fuel that burns quickly, and in its entirety with no knock. Take for example a RR Phantom. If you use that car with 87 Octane, you will hear the engine knocking and eventually you will damage the engine.
Super Luxury cars such as the Bugatti Veyron require no less than 97 Octane (Racing Fuel) which costs $8 a gallon.
I'd say the best gaoline stations to buy from are BP, EXXON, SHELL, and HESS. These are well-known, trustable gasoline marketers who are more likely to sell you what you pay for than to try and rip you off by adding water to your gas or selling you false octanes.
What kind of milage are you getting on your 4cyl Volvo 740?
frozenblue
I've got a the 1990 GL with the Volvo (non ZF) transmission and I'm averaging 20 running midgrade with half highway driving and half regular stop and go driving. I try to drive as efficiently as possible, distant braking, slow steady accel., right turns instead of left, etc. I'm just wondering if Anyone is getting better milage. I ran E85 and was getting 18mpg, which doesn't cut the 30cents difference in pricepergallon versus regular gas.
Answer
These Volvo 740's are excellent cars in terms of build quality, durability, and dependability, but one thing they are not is fuel efficient. We have had 3 Volvos in our family, all with the same 2.3L 4cyl. engine, and they were all pretty hard on gas. My '85 240 averaged 21mpg, my Mom's '89 740 turbo averaged about 18mpg, and her current '95 940 averages about 20mpg, all with a mix of about 70/30 city/highway driving. That seems to be one main downfall to the good old Volvos. They guzzle gas for 4cyl. powered cars. Even considering their size and weight, the similar size and weight of a Ford Taurus or Chevy Lumina (both with V6 engines) achieve similar, if not slightly better, economy ratings. Volvos have never been known to be fuel efficiency, but they are one of the few foreign luxury cars that are designed to run on 87 octane, expect for the turbo models.
These Volvo 740's are excellent cars in terms of build quality, durability, and dependability, but one thing they are not is fuel efficient. We have had 3 Volvos in our family, all with the same 2.3L 4cyl. engine, and they were all pretty hard on gas. My '85 240 averaged 21mpg, my Mom's '89 740 turbo averaged about 18mpg, and her current '95 940 averages about 20mpg, all with a mix of about 70/30 city/highway driving. That seems to be one main downfall to the good old Volvos. They guzzle gas for 4cyl. powered cars. Even considering their size and weight, the similar size and weight of a Ford Taurus or Chevy Lumina (both with V6 engines) achieve similar, if not slightly better, economy ratings. Volvos have never been known to be fuel efficiency, but they are one of the few foreign luxury cars that are designed to run on 87 octane, expect for the turbo models.
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