And what are the benefits of using 'premium fuel'? High octane fuel is primarily used on high-performance engines such as turbocharged cars because the fuel does not burn prematurely, although many car owners choose high octane fuel for use in their non-turbo powered vehicles.
Unless your car explicitly needs the high octane fuel, you may not need to use it. Higher-octane fuels allow engine manufacturers to design more powerful and fuel-efficient engines.
But there are a few things to consider, because some engines will perform better on high-octane fuels while others will show no obvious benefit. And high octane fuels may even cause engines with very low compression ratios to run poorly. Let's get a bit technical here: an octane rating is the ability of the high octane fuel to resist engine knock — the engine pinging or rattling sound that comes as a result of premature ignition of the compressed fuel in one or more cylinders.
To put it simple, RON is the tolerance of a fuel to be compressed prior to ignition without pre-igniting. The more a fuel can be compressed before combustion, the greater the power an engine can create. Most car owners are advised to use regular octane fuel. If you are using a high-compression engine such as those used in some high-performance cars, you will need to use either mid-grade or premium octane fuel to prevent knocking.
For the majority of vehicles, using higher octane fuel may improve performance and mileage and even reduce CO2 emissions when the vehicle is working hard, such as when towing a trailer or carrying heavier than normal cargo, especially in hotter weather. Each vehicle model has a recommended minimum octane requirement — often printed somewhere near the fuel filler cap — and owners should not fill up with a fuel grade lower than this, but a higher grade may offer the above mentioned advantages.
Refiners usually blend ethanol with gasoline to help boost its octane rating—most gasoline in the U. Ford Motor Company. Szybist, J. SAE Int. Fuels Lubr. Stein, R. Polovina, K. Roth, M. Foster, et al. Leone, T. Olin, J. Anderson, H. Jung, et al. Kalghatgi, G. Warrendale: Society of Automotive Engineers. Gibbs, L. Anderson, K. Barnes, et al. Motor Gasolines Technical Review. Chevron Corporation. Thomas, J. West, and S. Oak Ridge National Laboratory. Prakash, A. Octane Response of Premium-Recommended Vehicles.
SAE Technical Paper , doi 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. The Charger's manual says 87 octane will provide "satisfactory fuel economy and performance. Similar to the BMW, the Dodge's gains on the dyno 14 horsepower and 23 lb-ft of torque translated into negligible improvement in our real-world acceleration testing. Saddled with elephantine heft and eager to spin its rear all-season tires at launch, the Charger posted the same 4.
At triple-digit speeds, the higher power on 93 octane gave the Charger an advantage measured in tenths of a second.
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