what type of gas
Three Wheeling
Joined: Jun 2005
Posts: 92
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RE: what type of gas
The experts will tell you it doesn't matter. Even when a gas cap says "premium only" it will run fine on regular. This may exclude true exotic sports cars. Google the subject and you'll buy regular every time. I have a new '05 RR HSE and I asked the question of sales and service departments and they said go ahead with the regular. You'll never notice a difference, and from a mechanical point of view, no one will ever be able to tell either. Good luck.
Three Wheeling
Joined: Jun 2005
Posts: 92
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RE: what type of gas
High life pricey at the pump
By Margaret Webb Pressler
The Washington Post
WASHINGTON — For some people, it's hitting the big five-oh that really hurts — that is, dropping $50 on a tank of gas. For others, it's just that relentless upward creep in prices that gets their attention.
Whatever the trigger, drivers pulling up to the pump in vehicles that ostensibly require high-grade gas are wondering if they really need the more expensive fuel or whether it's OK just to fill it up with regular. As gas prices soar, car owners increasingly are going for the cheaper stuff — no matter how fancy their wheels. And station owners and oil companies are seeing the impact: Sales of premium and mid-grade gasoline are tumbling.
It's an age-old response, industry experts say, for drivers to switch from pricey, higher-octane formulations of gas to cheaper alternatives whenever gasoline prices rise substantially. Now, with prices stuck stubbornly high, oil experts wonder whether high-grade gas will go the way of the Studebaker.
"I foresee no serious decline in prices anytime soon, so the question is, will consumers' buying habits change permanently if the higher prices stay as they are," said Daniel Gilligan, president of the Petroleum Marketers Association, which represents independent filling stations.
Automotive experts say using regular gas in most vehicles does no damage and makes no discernible difference in performance. Cars made in the past 15 years have such highly refined computer controls that the engine will adjust to the grade of octane in the gasoline, even in cars sold as requiring premium gasoline. Some drivers — in some cars under some driving conditions — may notice a drop in horsepower, but for most people behind the wheel, it wouldn't be enough to notice, the experts say.
"It's not going to hurt anything," said Peter Gregori, service manager for EuroMotorcars, a Mercedes-Benz dealer in Bethesda, Md. In fact, Gregori has been using regular gas in one of his own Mercedes cars for two years, and "it's perfect," he said — even though Mercedes-Benz says owners should use only premium.
"I get better mileage with the regular than I do with the high-test, in this particular model that I have," Gregori said. Among cars that come in for service, Gregori said, he can't tell which have been sipping premium.
Apparently, drivers are figuring this out.
Nationally, sales of premium gasoline fell 5.6 percent this year through May, the latest data available, according to the Energy Information Administration, while overall regular gas sales were up 4.7 percent.
The first drivers to defect from premium, station managers say, are those whose cars don't specify a need for premium gasoline but who were using it anyway, thinking it might help — even though most experts say it won't. But even owners of cars that purport to require high-test — complete with a warning on the gas cap, "Premium Fuel Only" — also are trading down.
Although the numbers are slightly different in some states, premium fuel typically has an octane rating of 91 while regular fuel's rating is 87. Octane controls the fuel-air mixture in an engine to keep it from igniting before it's supposed to, which can cause reduced power and harmful knocking.
But in all modern cars, computers adjust the timing of the engine's compression so that "pre-ignition" never happens, said Cole Quinnell, a spokesman for Chrysler Group Engineering.
For their part, the oil companies say they're just providing the fuel that carmakers demand. "Our responsibility is to fill the need and provide what the consumer would require for their cars to work most efficiently," said Gerald Davis, a spokesman for Sunoco.
By Margaret Webb Pressler
The Washington Post
WASHINGTON — For some people, it's hitting the big five-oh that really hurts — that is, dropping $50 on a tank of gas. For others, it's just that relentless upward creep in prices that gets their attention.
Whatever the trigger, drivers pulling up to the pump in vehicles that ostensibly require high-grade gas are wondering if they really need the more expensive fuel or whether it's OK just to fill it up with regular. As gas prices soar, car owners increasingly are going for the cheaper stuff — no matter how fancy their wheels. And station owners and oil companies are seeing the impact: Sales of premium and mid-grade gasoline are tumbling.
It's an age-old response, industry experts say, for drivers to switch from pricey, higher-octane formulations of gas to cheaper alternatives whenever gasoline prices rise substantially. Now, with prices stuck stubbornly high, oil experts wonder whether high-grade gas will go the way of the Studebaker.
"I foresee no serious decline in prices anytime soon, so the question is, will consumers' buying habits change permanently if the higher prices stay as they are," said Daniel Gilligan, president of the Petroleum Marketers Association, which represents independent filling stations.
Automotive experts say using regular gas in most vehicles does no damage and makes no discernible difference in performance. Cars made in the past 15 years have such highly refined computer controls that the engine will adjust to the grade of octane in the gasoline, even in cars sold as requiring premium gasoline. Some drivers — in some cars under some driving conditions — may notice a drop in horsepower, but for most people behind the wheel, it wouldn't be enough to notice, the experts say.
"It's not going to hurt anything," said Peter Gregori, service manager for EuroMotorcars, a Mercedes-Benz dealer in Bethesda, Md. In fact, Gregori has been using regular gas in one of his own Mercedes cars for two years, and "it's perfect," he said — even though Mercedes-Benz says owners should use only premium.
"I get better mileage with the regular than I do with the high-test, in this particular model that I have," Gregori said. Among cars that come in for service, Gregori said, he can't tell which have been sipping premium.
Apparently, drivers are figuring this out.
Nationally, sales of premium gasoline fell 5.6 percent this year through May, the latest data available, according to the Energy Information Administration, while overall regular gas sales were up 4.7 percent.
The first drivers to defect from premium, station managers say, are those whose cars don't specify a need for premium gasoline but who were using it anyway, thinking it might help — even though most experts say it won't. But even owners of cars that purport to require high-test — complete with a warning on the gas cap, "Premium Fuel Only" — also are trading down.
Although the numbers are slightly different in some states, premium fuel typically has an octane rating of 91 while regular fuel's rating is 87. Octane controls the fuel-air mixture in an engine to keep it from igniting before it's supposed to, which can cause reduced power and harmful knocking.
But in all modern cars, computers adjust the timing of the engine's compression so that "pre-ignition" never happens, said Cole Quinnell, a spokesman for Chrysler Group Engineering.
For their part, the oil companies say they're just providing the fuel that carmakers demand. "Our responsibility is to fill the need and provide what the consumer would require for their cars to work most efficiently," said Gerald Davis, a spokesman for Sunoco.
Rock Crawling
Joined: Jul 2005
Posts: 274
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RE: what type of gas
The books say premium. technology says it dose not matter. The best way to find out is to try what works for you. The markers you would notice is are a knock in the engine. the other would be a decrease in power/acceloration. The knock will be a big factor. not a good thing. the computer should correct the air/fuel mixture so it should not happen. Give it a try and see what happens. If it works and there is no noise from the engine there will be no effects on the motor. The problem with octane started before the computers and vehicles were set up for a certain level of proformance. You may want to try a middle grade. I would start with the middle grade first. Hope it helps. gotta love a rover.
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