Regular instead of Premium Gas?

[michiganstategogreen]

Originally Posted by CincySpartan

So, just bought a new car and it says on the inside of the Gas Flap thing to only use premium.

Just curious if I really need to do that, and if I don't what the hell will happen?

Anyone know the answer....

Run your car on a tank of regular - if there is no engine knock, its fine.

[I shot Betty Crocker]

Originally Posted by michiganstategogreen

Run your car on a tank of regular - if there is no engine knock, its fine.

Not true. On a new car, if you hear engine knocking, something is seriously f-ed up. The electronic system will just continue to cut back on the timing to the point where you can probably run your car on Jack Daniels and still not hear any knocking.

Just because it isn't knocking doesn't mean it's fine though. As discussed, running regular in an engine designed for premium can result in lower power, worse mileage and can damage the engine over time.

[I shot Betty Crocker]

Originally Posted by Chris Rucker Chris Rucker

Aren't there cars out there from the 70's that only run on "Regular" vs. "Unleaded"? What are they supposed to do?

They add a bottle of "lead substitute" fuel additive when they fill up.

[Cym Jim]

What type of car is it? - I know some manufactures have put out releases saying midgrade is fine, even though it says premium on the cap . . .

[spartyms2]

Originally Posted by CincySpartan

Infiniti G35S

I know it's not that big of a difference, but it adds up.... out here in Cali premium is around $4.90 and regular is around $4.57

Good choice. I just got my G35x a few months ago.

[TheGhettoHeisman]

I figured someone who'd buy a luxury sedan would have the scratch to fill it with premium.

[TheBobcat]

I have a BMW 325i that says Premium only, I put in 87 and I don't notice any difference at all. No knocking, no performance loss.