thor_woody

Ok so I put 110 race gas which was leaded but it was mixed with 91 unleaded whats the worst that can happen to my motor. I only put 6 gallons of race gas in

Arca_ex

iTrader: (10)

Why did you do that.... won't do anything to the engine, might have a little loss in power and really shitty gas mileage. Leaded gas will on the other hand annihilate your catalytic converter.

thor_woody

Just to see what it ran like its the first time tho

Arca_ex

iTrader: (10)

Well maybe try doing some research next time you decide to experiment... high octane gas won't do anything for performance unless you tune for it.

So just be careful your cat doesn't get poisoned by the leaded gas and know that you've significantly shortened the life of your oxygen sensors, it's very hard on them as well.

Arca_ex

iTrader: (10)

You do know that we measure octane differently in the US... right...

91 isn't "crap" it's the highest octane you can get in most states and if I remember correctly is the same as your "98" octane over there.

bse50

rotaries don't really like leaded fuel. Think about the deposits being stuck under the seals, clogging the springs.

95ron is fairly low, add 10+% of ethanol and that's a shitty gas it must suck to drive in america :D

Old Rotor

I remember lots of lead deposits on my spark plugs on Rotaries in the seventies. I had to remove clean and adjust them every 4K....every month back then. I was glad to see lead go and think the Rotary engine made spark plugs advance faster.

Arca_ex

iTrader: (10)

Not really, considering gas is like half the price of yours here in America. If 91 is equal to your 95 then our 93 is probably equal to your 98. That stuff is only available in some areas, I think it has something to do with elevation. Going from 91 to 93 makes zero difference, and even if you tune for it, you won't see any crazy gains from it, especially N/A.

bse50

I know that there aren't many differences but your watered down equivalent to our 95ron really is crap compared to ours. That was my main point.
Tuning wise there's a little gap between 95 and 100, not so much going only half way up to 98.

Mr_Pieper

93 is more readily found in the Midwest. 91 is used more along the coasts because there is more of a demand for premium. This is due to the larger amount of trucks and whatnot used in the Midwest in contrast to more giant luxury cars on the coasts. The refineries that supply these areas have to make less 87 if they make 93. Making 91 allows them oil companies to save money. I know people with turbo cars that are tuned in a 93 area that have had problems going to 91. Coincidentally, the 93 available here in Missouri is also usually one of the cheapest places for gas in the country.

bse50

Aren't trucks diesel?

ken-x8

93 is pretty common on the east coast. I regularly drive from Virginia to Connecticut and, other than a few cut rate outfits, premium is always labeled as 93. Not too many places have 91...it's usually 87, 89 and 93.

A little frustrating that I have to pay for two points more than the 91 Mazda specifies. And, with E10 being pretty universal where I drive, it's annoying to get only 90% of what I'm paying for.

Ken

paimon.soror

iTrader: (15)

Yep 93 very common here in CT, Mobil Super+, Shell V-Power and Sunoco Ultra are a few of the 93. Sunoco Ultra used to be 94 until a few years ago

Mr_Pieper

Ultimately, it is a mixed bag around me. Gas stations next door to one another could have either 91 or 93 with an oddball 92 sometimes. They all cost the same, though.

jtspells

iTrader: (1)

Unless i have wrong info, (entirely possible) 91 is usually Cali emissions states 93/4 is not.

Arca_ex

iTrader: (10)

Isn't the only California emissions state... well California....


We only have 91 here in az and we're normal federal emissions.

Mr_Pieper

10% ethanol is not so bad. It burns colder and cleaner like alcohol. At the end of the import drag racing craze there were some teams tuning to run the straight E85 stuff. Like alcohol, you need more volume for the same results, but burning more fuel is not a concern in drag racing where you fill up after every run. It allowed for some of the fwd cars to run 40 and 45 lbs. of boost without as many issues as it burned better.

And bse. The highest selling vehicle in the United States is the Ford F-Series line of trucks. Some of the larger ones are diesels but most are V8 trucks that burn 87 octane at the same rate as our spinning triangles.

In the Midwest, someone looking to spend 30 or 40k on a vehicle is gonna go for that Ford truck or a Chevy Tahoe over a Lexus or BMW 3-series. More vehicles use 87 and we get more 93. The opposite is true in California. Those cars demand more premium and the refineries want profit margins, so 91 it is.

Oh yeah. Arizona is probably supplied by the same refineries serving California. My father-in-law complains about moving there and only getting 91 for his money now. The change means a few pounds of boost are lost to keep from knocking. My rant is over now and my blueberry muffins are ready to come out of the oven.

bse50

I'm a track rat so I wouldn't run e85 EVER. Even on a turbo car.
Extra fuel consumption and wear for the same safe power output I could get with 100ron fuel and a good tune

Ethanol is bad from every perspective you look at it. It's just there to increase subsidies.

Mr_Pieper

I know. Just trying to put a positive spin on it and let some information seep out of my head before it is permanently stuck. I also said it was only good for the drag racers. I sure hope the proposed 15% never happens. Also, I live near many corn fields. Those are so boring to drive past.