What will happen if i run regular gas in my car that says "PREMIUM GAS ONLY"?

(2011-02-26 15:25:45) 1. Killa Drew Says: I have a 03 Subaru WRX...and it say to only run premium gas in it, what will happen if I run regular gas through it?2. cjo84070 Says: High compression engines require higher octane gas to prevent detonation. This is the pinging you hear when using low octane fuel. In extreme cases detonation can burn holes in pistons and cause other damage. If it says premium use premium. Other cars with lower compression can use regular all day. They won't see a benefit from premium fuel.3. Joe Smith Says: the engine "knocks" which your car will adjust to temporarily but it will eventually knock again which causes damage in the long run. also you will get bad fuel economy and bad performance.4. Edward the Less Says: It will likely ping, your fuel economy most likely will go down, your horsepower will drop and you could conceivably be doing damage to your engine.5. Dependra Karki Says: it wiill be damage Tag: What will happen if i run regular gas in my car that says "PREMIUM GAS ONLY"?