Is premium gas worth it? We test high octane on four popular vehicles: FlashbackFriday
18 years ago, an Accord powered by a 3.0-liter V-6 made more power and accelerated quicker on regular fuel than on premium. The modern CR-V, with half the displacement but rated at just 10 fewer ponies, makes the same argument: don't waste your money on premium. Switching from 87 octane to 93 yielded a 7-hp gain on the dynamometer, but that advantage was lost in the noise at the track.
The dyno results shocked us. Not because of the 13-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. On either fuel, the über 5-series is seriously underrated. While BMW claims 617 horsepower at the crank, the dyno reports it makes that much at the wheels on 93-octane premium. And both fuels produced significantly more torque than BMW's advertised 553 lb-ft.
While Ford's EcoBoost F-150 stands out as an obvious exception, the Dodge Charger's numbers make for a tidy summary of our findings. If you buy fuel with an octane rating above the manufacturer's requirement, you're likely to feel it in your wallet more than the seat of your pants.How your engine constantly invites and silences engine knock to estimate a fuel's octane rating.
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