kerdmann

the manual says the ct (or tt, what does that stand for?) adjusts

to lower grade fuel - how low in us grades?

i assume it doesn't enhance performance, but is it safe and

how common is it's use

ltc

You can run as low as 89 (R+M/2....US rating) fuel, no lower.

kerdmann

lewis,

appreciate your advice.

judging from the response, nobody would even think of not

using premium. well, living at the baja border you wonder about

such things, although the mexican gas has changed over the last twenty

years.

I guess no answer is an answer, too.

38D

Personally I would run the highest available (in the east coast of the US, that's 93). The main reason is that if you run lower and your knock sensor goes bad, you'll hose your engine. If 89 is $.20 cheaper, you'll save about $200-$300 for an entire year (20-24 gallons/week * $0.20-$0.25 * 52 weeks). It's just not worth it.

GM Austin

If you can get 93 or better octane, yes, use that. But many places don't have anything close to that. And I'm not just talking about Baja. Many rural areas across the US don't stock higher octanes. Often you have no choice; 89 could be the best you can buy.

beemaze

In southern CA, 91 octane is typically the best you can get. I do remember about 10 or so years ago 92/93 octane was common, but no more - likely from higher costs associated with removing MTBE and other CA state requirements. However, there are a few Union 76 stations that sell 100 octane at $5.65/gallon - ouch! I have been tempted to try, but when gas prices jumped up I said "fugetta about it..."

rting

Totally agree.

Up above the 49th parrallel, we do have 94 octane. In fact, Petro-Canada advertise that if you use 5 tanks of these high octane gasoline, your engine would feel like it is new. Personally, I would use the highest possible to keep the engine functioning at its best.

If it makes my C S goes faster ... all the better!

Moogle

i've been using 93 on my car since i bought it new in october 02 (03 boxster S)

occasionally get some 100 octane or 94...

never anything lower

guess that will change when i move to cali.

Torags

Come on out, You look like you'll improve the scenery......

Moogle

househunting in the bay area in august! oh can't wait, no more new england winters... (faints)

DEETZ22

I always get 93, used to get 94 when it was still available. I never go below 93.

Torags

You have to dig deep in your jeans for Norcal RE. Be prepared, it's the most expensive in the US.

That's the bad news, the good news is, regardless of what you pay - those who follow you will pay more.... That's my RE experience

Good luck... & welcome