It's ILLEGAL?! Wow! Why? Do they think you're going to drive off?

 

yeah its illegal in jersey to do that aswell I think but there its not bad either. over here its 2.79 for 89 and if its full service its 3.29 for 89

 

paid 2.60 for premium today..

 

Safty issues I guess...lol I think they think we're to stupid to pump our own.

 

lol I'd much rather pay a lil bit more to have them pump it but over the bridge in WA is about $0.10 more then portland and they pump their own

 

Yeah it's cheaper in Portland then Medford too in fact from about roseburg on up it;s cheaper. Still would rather pump my own most are careful but now and then you get that dummy that spills it down the side of your car. I hate that.

 

wow north cal its 3.09 for 93
but only at my favorite shells location.
other places is like 5cents more....

its dropping???

 

yeah gas is going down. couple of weeks ago it was 2.89 now its anywhere between 2.59-2.69

 

Gas just went down overnight around here... most premium stations are down from $2.49 to $2.39.

 

its like $3.03 for premium here in nor cal. man i wish it was $2.50 here.

 

$2.86 for 87 today

 

damn wtf i see people pumpin for cheap

$2.83 87 Chevron LA area

 

tC's don't require premium, do they? I guess if they're supercharged they might...

 

yeah its required once your boosted. supercharged or turbo. i wish i can pump 87 again.

 

Paid 2.69 for Shell V-Power 93. Yes I run premium. No I'm not boosted.

 

Just to clear things up, you know that higher octane is just for anti-knock purposes in high-compression engines, right? In other words, gasoline with a higher octane rating actually resists detonating more than lower octane gas. There's not any more power in "premium" gas than regular. In fact, some higher octane fuels actually have a lower energy content than low octane fuels.

 

Lol I'm not doing it for power. My car is an automatic. I started using premium when I began to hear a rattling noise when the car is in 4th and under load, most of the time when going uphill. I'm sure you've heard it on Nissans if you ride with your windows down a lot. Some places I've read said it was an engine knock, others say its the harmonic balancer. Whatever the case, it doesn't happen when I use premium.

 

Interesting... I had an old Chevy van that had so much carbon buildup (which increases compression) that it would knock on 89 octane (some brands more than others). That van had about 350,000 miles on it, so I wasn't going to spend any money cleaning the head... so I started using mid-grade and that prevented it from knocking.

Hopefully your tC isn't carboned up... but I guess it's possible. Have you tried a good combustion chamber cleaner? Maybe some SeaFoam? It's a long shot, but maybe it would help.

Just remember that there may be a more serious problem and using higher octane fuel may just be covering up a ticking timebomb.

 

I'm at 60k now. I've never used Sea Foam. I don't see why I'd have an unusual amount of carbon buildup. I've heard newer cars make the same noise in the same situation. The only common factor would be the fuel. I read that the introduction of Ethanol into auto fuels could be the culprit.

 

Ethanol shouldn't cause a problem... the fuel still has to meet the octane number that is posted on the pump. I would investigate it, because it could be a warning sign of something bad about to happen. A stock tC should not have pre-detonation with 89 octane gas.