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Originally Posted by Subie
I'm sorry but that's not true. Yes, it does have knock sensors, and it WILL pull timing, but that can only do so much. The engine may still knock under certain driving conditions which will damage it over time. The FA20/4U-GSE requires premium fuel. It's exactly what it sounds like.
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I must ask you to prove it then. Nothing that I've seen or read says that a factory ECU cannot compensate enough for regular grade. I have even seen people run regular on "premium only" engines for many years without a problem.
Edit: Since it's common knowledge and you are refuting it. I did make the initial statement so I will add that you can do a quick search for
"can you run regular in a premium engine" and find this.
Why use premium gas when regular will do?
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The main advantage of premium-grade gas is that it allows automakers to advertise a few more horsepower by designing and tuning engines to take advantage of premium's anti-knock properties. But auto engineers generally agree that if you use regular in a premium engine, the power loss is so slight, most drivers can't tell.
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Quote:
The only modern engines that should really need premium are those with superchargers, which force-feed fuel into the cylinders. "You're driving along and just tramp the gas and the knock sensor cannot sense the knock fast enough in some cases," because the supercharger boosts pressure so fast, says Bob Furey, chemist and fuels specialist at General Motors.
Burning regular when the owner's manual specifies premium won't void the warranty, nor damage the engine, even the most finicky automakers say. "You're giving up perhaps just a little bit of performance that a customer wouldn't really even notice, it's so slight," says Furey.
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I still say run the highest grade available. It's not like it's expensive.
