around here finding octane 91 is not very common, so i end up putting 93 octane.. the manual does say 91 or higher but i wonder if using 91 is preferred over 93?

any cons to using 93 vs 91 since 91 is not widely available here?

 

only that you're spending more money than you should (marginally). you could fill up half 93, half 89, and be left with 91. i just fill up with 93; i have never seen 91 octane, but i know that each state's designation of "regular, midgrade, and premium" all tend to differ, most notably here on the east coast vs. places like colorado.

it would be a big waste of time and a hassle switching nozzles mid-fill up, so just fill up with 93 octane

or 87 octane if you want ignition delay (slight drop in performance, which varies from engine to engine).... the rule of thumb is: if the manual says use premium, use premium. if it recommends 87 octane, there's no benefit of using midgrade or premium. if you're worried about a $2 or $3 difference per fill up and you bought a $30,000 car, you have problems.

 

Don't try to make 91, just put the 93 in and be done with it.

 

the gas stations here are retarded, they all carry different octane.

gas station one: 87, 89, 91
gas station two: 89, 91, 93

there are some stations with 91 octane but none close to my town.

 

especially since the pump usually closes the credit transaction as soon as you hang up the nozzle. so you'd basically have to start the whole process over.

 

This doesn't make any sense. Both gas stations you listed have 91.

 

lol it was a bad typo.

gas station one: 87, 89, 93
gas station two: 89, 91, 93

second gas stations octane are a sporadic find.

 

Chevron with Techron 93 premium baby!

 

whooo... low octane's in usa, in europe octane 95 is standard, octane 98 is for some 'premium' engine's. My honda dealer advices me to put in 98 because of it has some more power and it should run more economical than 95. Driving with 95 though... petrol is so expensive, €1,35 for a litre octane 95 fuel = €5,11 for a gallon = 6,15 $ for a gallon.

 

Correct me if I am wrong. Octane is calculated differently in different parts of the world.

 

Here in Cleveland our only options are 87 89 and 93....so my baby gets 93 all the time!

 

i don't know about that; as we've proven in this thread, "midgrade" and "premium" are interpreted differently.

 

Anything over 91 and your motors toast!!

 

I believe that's right. In the US, I know we use R+M/2, the average of Research Octane and Motor Octane (R and M). I think the European standard is different and tends to report the same gas higher.

 

US uses pump octane number ^^ (R+N)/2, while the rest of the world does RON. I did some calculations for the equivalent octane numbers before. I'll search and post them up:
RON PON
98 = 93
95 = 90
91 = 86

 

I put 89 because gas price is much much higher in Canada. I believe it is at least 2.75 a galllon to fill up with premium now.

When I go to states and see the signs with low 2.xx's, I fill up with premium and drive like I stole the car.

 

do a quick search on the word octance, you'll find thread(s) detailing this endless topic!

 

Com'on... you are in canada-oil-land of Alberta already!!! No Provincial Sales Tax to begin with!!! Why buy a 30k+ car when you are going cheap on gas?!?!?