All I know is oxygenated fuel gets worse mileage, pings horribly (requires more octane), and less power. Oxygenated fuel is really fuel with alchohol added, the alchohol isnt as explosive and burns cooler, thus less power, requiring more foot and more octane....Its called oxygenated fuel, but its not oxygen they are adding... its designed for lower emmisions, but you have to use more of it so it may be cleaner per unit burned but it takes more units to burn, end result is about the same.

 

In our race bikes, we can notice a huge increase in giver using vp fuel over premium fuel. Its true it burns faster, and its friggin expensive. Im confused, are you saying it wont give me any more power? Is it just the great smell working into my brain making me think im going faster? Or is it the smell that makes everyone on premium move slower?

 

I religously use 87 or 88 octane gas.

Some places the regular unleaded is 87. Other places it is the unleaded plus that is either 87 or 88.

Don't understand why this is. I figured all regular gasoline should be at least 87.

 

Head up in altitude, regular is 85 in places....

 

Ahh... The smell is great isn't it?

I'm thinking there is a difference between the oxygenated fuels we are talking about. VP racing gas that's oxygenated definitely produces more horsepower than regular high octane gas, but you also have to rejet the bike to allow it to produce more power.

Maybe the difference is that the fatory ecm's can't handle that adjustment...

 

Yeah... i am thinking big difference too... the stuff I am talking about it the "winter" fuel they use in some bigger cities in the NW. Its supposed to drop emmisions... its really really crappy gas...certainly not racing fuel by any means

 

.99? are you serious? that will never happen.

 

only car I own that I use 93+ in is my turbo 350z.

the 3vze gets 87 octane (it eats too much to use anything else, really)...besides the fact that its computer isn't intelligent enough to take advantage of higher octane like those of most more modern cars (via adding ignition timing after receiving feedback from the knock sensor. The KS in these cars is almost worthless)

 

well since i've noticed this thing pinging, i've only used chevron or 76 brand 91, plus octane booster

but if i could get it to run without a fuss on 87 i totally would. gotta start fixing stuff here

 

I only use 90 Octane or higher in my 3.4L 4Runner!! Anything lower just pings and doesn't perform as well as it can!!

 

I've used 100 Octane airplane gas in the past. Airplane gas has lead in it still.. My truck just burns right through that stuff, lowers my MPG, no special performance gains. Now i just use 86 (we're at 6-7000 feet in SF)

 

I've used all three feeling out mine when I got it, finally settled into 87 only. Have notice diffence in 87 xon and 87 alcohol blends. 87 pure fuel runs quieter.

 

It's also bad for your 02 sensor... I'd run 100LL for tuning purposes on a turbo motor, but other than that, what's the point?

Use the minum octane that allows you to run your motor without pinging.

 

using leaded gas killed your o2 sensor and your cat converter.

Your truck's ecu isn't capable of knowing when higher octane is put in, therefore not able to increase ignition timing to take advantage of the octane.

On most, if not all n/a engines, high octane gas is worthless and useless.

 

Your cat is probally suffering from that now... it will plug the crap out of your cat converter...

There are very few engines that really compensate for octane, the new 4.0 is one of them...

 

I use 87 but now and then I fill up with 89. Truck started to ping for awhile So i used 91 until I used a fuel system cleaner. Pinging went away now its back to 87.

 

My truck is stock, with a few bolt on's so I use C16, it's about 118 Octane.......


Later

 

My '91 22RE lives at sea-level in SoCal, and pings like crazy w/ the regular 87. It still pings a little on occasion with the 91. When I go to Utah, it stops pinging(Utah gas, I assume), but at the same altitude pings on Arizona or CA gas.

 

I used 87 octane in my 22re and now in my 3.0 too. no problems so far. sometimes when in go wheeling thought i like to fill up with 89. just a treat for the old girl...

 

Mid-grade is a total ripoff. It is one of the strategies used to pad the bottom line. You pay more than half the difference in price between premium and regular and get less than half the octane rating difference. Most stations mix the fuel from two tanks (regular & premium) in the pump to get the mid-grade.

I run regular (85 in CO) in my 22R-E and premium in my Subaru H-6 3.0L, since it will actually advance the timing for the higher octane. With the Subie, I've seen about 5% improvement in fuel mileage on average. Gonna continue until a year has elapsed and evaluate the economics of it at that point.

Tried premium in the 22R-E many years ago. No difference in performance, as long as it was properly tuned. By running the premium, was just padding the fat wallets of big oil...