Ron

I used to have a few service stations that sold pure gasoline 93 octane, now those stations only have pure gas with 90 octane. They all sell 93 octane with ethanol.

Why no more 93 pure gas I have not been able to determine.

So question is which better choice at this time? 90 octane pure gas or 93 octane with ethanol?

Steve Weiner-Rennsport Systems

Use 93 with ethanol and add Marine Stabil for protection.

GBX

Interesting.....how frequently??

Bill Verburg

The only place I've seen 93 or better pure gas is at racetrack pumps

91 pure gas has been generally available around here for a few years

From what I can see 91 pure will run as well as 93 w/ 10% ethanol. The reason is that the energy content of the ethanol blend is lower so a larger volume of fuel will be needed, this causes the injectors to run closer to the ragged edge of their duty cycle where they are less efficient. This is for track use, in street use it's probably not much different.

I've been using Startron(preferred) or Stabile for longer term storage when an ethanol blend is in the car. The reason for using a stabilizer is that gas and ethanol will separate from each other over time w/ temperature fluctuations( spring and fall are the worst), The stabilizer alleviates the issue.

cdturne

How much StaBil Marine to use to counteract the ethanol? I've been using 1oz/10 gal. Is that enough?

Also, I usually pour it in after fill up so it doesn't get "mixed" in till later. Is this an issue?

Thanks

Cactus

Why wouldn't you put it in first so it gets mixed right away?

NC TRACKRAT

This may be of use: http://www.pure-gas.org/extensions/map.html

nine9six

Thats what I do...Marine Stabil in first, then fuel to mix it thuroughly in the fuel tank.

djantlive

How does stabil improve the gas?

pp000830

I use whatever 93/92 pump gas that is available. Once a year I put two consecutive tank fulls with Techron added. Seems the issue with alcohol blended gas for a daily driver is overblown. Now for cars stored over winter or that sit for weeks at a time treating the fuel may always be a good idea.

EMBPilot

you do this regularly, every tank? i had no idea this was commonly used in our cars

HPNer

A question on octane rating from a guy called Ron . . .
You couldn't make it up . . .!

sdm100

Stabil makes an ethanol treatment so you don't need the marine brand

http://shop.advanceautoparts.com/p/s...FYEYgQodZ9ULtA

fsa

Stabilizers like Stabil are critical to use in small gasoline engines, like lawnmowers. Ethanol gums up carbs and loves to help digest rubber.

HOW MUCH STA-BIL® ADDITIVE SHOULD I ADD TO FUEL?
For STA-BIL® Storage, use one ounce (30mL) to 2½ gallons (9.5L) of gasoline, gas/oil mixtures, or ethanol blends.

For STA-BIL 360° Performance, for storage and everyday ethanol treatment​ use one ounce (30mL) to 5 gallons (19 L) of gasoline, gas/oil mixtures, or ethanol blends.

For STA-BIL 360° Marine, for storage and everyday ethanol treatment​ use one ounce (30mL) to 10 gallons (38 L) of gasoline, gas/oil mixtures, or ethanol blends.

Steve Weiner-Rennsport Systems

Yessir!

This is the correct way to use ANY fuel additive.