On a daily basis, most of us drive a car or truck that requires regular, unleaded gasoline. This makes it pretty simple when we fill up at the gas station. But every once in awhile, someone may accidentally fill their vehicle with a different gasoline than usual. However, if your manufacturer requires premium gasoline and you put in regular, you may have some problems. In most cases, the vehicle will run fine, but you may experience less power and a decrease in gas mileage.
These things could damage your engine and you should take it to your mechanic. A mechanic once advised me to run 2 tanks of premium, name brand fuel, back to back, once a year. He explained that that the premium gas contains cleaning additives that would help my engine to run its best. Is that no longer true? I know that all fuels come out of the same reserve, and the only difference between them is the additives. The A. By Alan Henry. 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. The Charger's manual says 87 octane will provide "satisfactory fuel economy and performance.
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