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Does premium gas last longer? Premium gasoline does not last any longer in storage than regular grade, unless it is alcohol free. In that case it can be stored longer, but it should still be used within a few months if possible. What happens if I use 89 instead of 93? If you opt for a higher octane than your manual recommends—say, 89 instead of 87—your car will be perfectly fine, an article on AAMCO's blog explains.
It will not, however, improve your car's mileage or give it any sort of extra performance boost, according to Car Talk. Which cars require premium gas? While the compact Buick Envision's base 2. Buick Regal. Chevrolet Equinox. Chevrolet Malibu. Chevrolet Traverse. Fiat Fiat L. Fiat X. Can I use octane booster instead of premium gas? If you want high-quality octane fuel, you should be ready to pay for it.
Octane boosters will work out only for high compression engines like a sports car. Race cars and performance cars are designed to run on high-octane fuels because these types of fuels can generate power. Does the octane really matter? In a nutshell, the higher rating octane means the fuel will resist premature ignition aka exploding in the engines combustion chamber. The higher an engine's combustion rating, the higher the level of octane that engine needs to perform efficiently.
BMW requires octane fuel at a minimum, with 93 recommended, so we did just that, switching between the common forms of premium gas depending on which state you're in. Are Californians, with their watered-down premium, leaving something on the table? We wanted to know. The dyno results shocked us. Not because of the hp difference between 91 and 93 octane.
No, that delta was in line with expectations. Our jaws were left hanging by just how much power and torque we measured. While BMW claims horsepower at the crank, the dyno reports it makes that much at the wheels after driveline losses on octane premium.
And both fuels produced significantly more torque than BMW's advertised lb-ft. The higher-octane fuel trimmed a single tenth of a second across all of the M5's acceleration times. That results in a time-bending 2. The BMW also claimed the largest fuel-economy margin in the test, but the 0. The M5 Competition stands as proof that the octane rating does make a difference, although in the case of these two premium fuels, if you're forced to use 91 octane, you're hardly missing out.
At Naturally then, the Ford hauls ass as effortlessly as it hauls a half-ton of manure. When fed 93 octane, this pound, self-propelled wheelbarrow will crash 60 mph in 5. Power at the wheels dropped from to horsepower with the change from 93 to 87 octane. That difference seemed to grow, and we could even feel it from the driver's seat at the test track. Compared with premium fuel, regular feed sapped the F's urgency both leaving the line and in the meat of the tach sweep. The rush to 60 mph softened to a still-blistering 5.
Tapped into the Ford's CAN bus, we recorded a peak boost pressure roughly 1. The high-octane gas also helped when soft-pedaling the accelerator, elevating mph fuel economy from That won't make a financial case for running 93 octane, but then you didn't buy the expensive engine as a rational choice. You can think of this EcoBoost engine's more aggressive high-octane tune as a sort-of sport mode that can be switched on or off with every fill of its We always assumed that mid-grade fuel existed chiefly to bilk a few more dimes from the type of people who ask the dealer to undercoat their car.
Turns out it's also for owners of Fiat Chrysler's Hemi 5. With no mention of that on the fuel-filler door, though, a driver would have to read the manual to know. With just miles on the odometer and looking as if it had already been hand washed with grit sandpaper a half-dozen times, this Charger is unlikely to ever taste 93 octane again.
Oh well.
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