Okay so I went to the gas station today, and they were outta 87 fuel. I was in a hurry so I just bought 89 and left, but I noticed that the performance was a little better, and I got great gas mileage. My tank was empty (the gas light was on) and I only put in 1.5 gallons and I made it 20 miles, and the gas light did not come back on. This surprised me because I usually only get 15 mpg. I have read that lower octane fuel is better for our cars, not I am not so sure I believe that. I suppose I should try running 89 a few more times before I conclude anything. What do you guys think?

 

You suppose to run by using High Octane because of your t2.

Otherwise, your engine will get damaged. Read the user manual, man.

-Ryousuke

 

I don't think there is any difference except money at the pump.

 

If your N/A your fine with 87.. if your turbo it is recommended to use 91+ specially if you have any mods.


Actually, if you would have read the manual it calls for 87 octance unleaded.


But like I said, if its boosted use premium for the added nock prevention.

 

high octane burn colder due to fewer impurities, and therefore burns colder and runs cleaner.

 

ya my car ran great with higher octane. If gas prices werent so high i'd keep running 93+. Ever since i switched to regular my car hasnt been running as well... infact it runs pretty crappy

 

Teh T2 manuel sez 87 octane.

What ru smoking dood?

 

That aint true dood.

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm

 

I think u doods need 2 do more Search on teh forum coz I found lots of threads saying high octane is a waist of money.

 

On a T2 you should run 91+, helps prevent detonation. On a stock NA I don't think it makes any sense to run anything more than 87.

 

It took how many posts to finally get the RIGHT information out?

Very good

James

 

i plan to run mid grade on my tII tell the prices drop but at the same time i'm dropping the psi i will boost

 

The only advantage of higher octane is that is takes more heat to get it burning, so it prevents detonation. That is why higher octane gas can produce more power; the higher heat required allows more boost or compression. However, if you don't need premium gas to prevent knocking, it won't do you any good.

In fact, lower octane gas will burn more completely in a rotary engine, so it may actually be a benefit in itself.

--Alex

 

see this is fucked up, 1/2 the people say you don't need 91 and the other 1/2 said if you don't have 91 your motor is going to lean out

 

It just depends on if how much boost you are running.

It won't lean it out, but it will make it detonate if you are running too much boost or comrpession with low octane.

This was one my FAA test....

--Alex

 

Octane just means resistance to detonation.

 

come on now greg (turbo II) i run 89 on my na cuz 87 makes it ride like crap. im going to try 91 in a little bi just to see. but i think it really depends on your mods, i think there is a point at which you will see more gain in an na with 91.
btw if turbo go 91 its 20 cents more per gallon. 16 gallon tank that 3.20 more per tank. screw it and thats on an EMPTY tank normally itll be only 2.40 more, buck up and pay for it damnit, i hate when people nickle and dime theyre engines away

 

on the evo VIII the HP difference from 91 to 93 octane is 10hp.

 

dude in miami it's about 40-50 more per gal

 

You guys are loosing your minds if you think higher octane gas makes your car run better...especially on a rotary, unless you go to a REALLY crappy station and then go to a good one when you get high octane...you're literally BURNING your money away.

Octane is kind of like the point in which gas ignites, if it ignites to early you detonate, so higher tuned engines have to use higher octane - that's exactly why my performance goes down in my Galant, if I use 87, because my car is actually TUNED(stock) for it! :P

 

the only type of gas thats going to give you better HP on a car is ethanol. o ya it is up to $2 cheaper a gal then petrol gas and burns a lot cleaner. to bad this grate country we live in is refusing to let companies sell it at stations =(

 

You can't run ethanol in most cars, anyways. The RX-7 manual states explicitly that you should not exceed 10% ethanol concentration in the gas that you buy.

Biodeisel is the future, IMO, but that doesn't us any good, does it?

--Alex

 

HOLY **** NICE AVATAR!

 

the make car that auto switch the o2 level so you can use both ethanol and gas. you jsut have to get the ecu to put the right amount of o2 in the motor.

 

I know they do, but most car's don't do that. Ethanol eats seals, too, unless the seals in your engine were designed to resist it.

Every currently produced deisel engined car can run on biodeisel with no modifications, while enjoying more power and better lubrication. Plus, you can easily make biodeisel yourself, for less than $1 a gallon.

--Alex