Honda Car Forum

I have an RSX TYPE S 06

it might turn into a civic.

If the spec calls for premium grade and you are getting regular grade, the hazard is engine ping (detonation) that will burn valves and do other sorts of damage. The money you save at the pump...you will spend at the mechanic

loss of power .... the computer should be able to adjust the timing enough to not make it ping

Premium and high octane are usually for the fuel injection(so it doesn't knock). If you don't buy high octane, use the fuel octane boosters in the little bottles.

Over the long haul you could potentially mess up your emissions system. You may have a hard time passing the emissions test some states require to renew your licence plates/registration.There is also the possibility of damaging your valves.

you will leave behind junk in the cylinders of your car causing performance to go down, and bad damage to the piston, cylinder and valves.

in modern cars, most likely nothing will happen, except for the timing and loss of power. if your car requires 91 and you use 87, you'd probably be losing about 10% power.

You will affect the performance and potentially cause mechanical issues long term. When it starts affecting the engine, you will hear a little "knocking" sound. If it's just a short term issue (like waiting for the next payday--one or two fill-ups), then I wouldn't worry. If it's becoming a long term issue, does your local Sam's or Costco have a gas station in it? You can seriously recoup the membership price in gas alone if you're buying premium. Costco also has a AmEx Costco card that allows you to earn cash back, even on gas purchases.Good luck!

Well, unburnt fuel will stay in the cyl, and when it gets hot enough, it will cause a uncontrolled explosion and more then likely will bend the valves and crack the cyl wall. This explosion is often referred as 'detonation'.if your car says to use premium, you must use premium. People will tell you that the only reason youre supposed to use premium, is because it is a cleaner burning fuel, and this is not true.Premium fuel burns faster then regular, high compression vehicles REQUIRE a fast burning fuel.