Map of stations that have non-oxygenated gas
 

I took this from my friend on MNSC. Give him (Joel, aka Zola) credit for the work he did to create this. Original thread HERE.

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For those of you unfamiliar with the topic, Minnesota has some of the worst quality gas in the nation (in performance terms). Throughout the 1990s, the EPA put dozens of metropolitan areas throughout the country into a scheme requiring them to put additives in gasoline to reduce cold weather emissions. Not surprisingly, those additives hinder performance, more specifically making the gasoline burn much faster, which in turn will cause learning ECUs to noticeably scale back the amount of ignition advance they run.

In the past few years most metro areas nationwide have reached the air quality targets set by the EPA and have thus come off the Winter Oxygenate program. As you can tell from this document however...Minnesota has implemented its own statewide, year-round program for adding oxygenation to our fuels.

This has really been an issue for heavily modded Subaru owners in the Midwest (most of us using the TurboXS UTEC engine management), as people are noticing unchanged tunes running half an air-fuel point leaner due to winter gas. So in order to avoid issues, many people have had to do some combination of turning down boost, richening up their fuel maps, or retarding timing. Or find a steady supply of race gas.

Anyway, my car prefers non-oxygenated gas, as evidenced by piles of datalogs. So I've taken the Twin Cities stations from these two lists:

* http://www.mnssa.com/Non.html
* http://www.msra.com/NonOxygenatedFue...st08.16.04.pdf

...and geocoded the addresses and plopped them onto a map. Hopefully this will prove useful for some people besides me.

Map (3.2MB PDF):
http://www.socsci.umn.edu/~jkoepp/mn...Oxygenated.pdf

Key (showing names and addresses of the stations):
http://www.socsci.umn.edu/~jkoepp/mnsc/key.txt

Re: Map of stations that have non-oxygenated gas
 

Fixed links...

http://www.socsci.umn.edu/~jkoepp/mn...Oxygenated.pdf

http://www.socsci.umn.edu/~jkoepp/mnsc/key.txt

Re: Map of stations that have non-oxygenated gas
 

Links fixed, thanks Chris.

Re: Map of stations that have non-oxygenated gas
 

Too bad California is still Enviornmental gasoline. Gas Mileage sucks, performance sucks.
For those of us that do not have Non-Oxy gas stations, what can we do to either increase performance, or increase gas milage. I only live 30 miles from work and spend around a quarter tank. Its horrible, Any ideas?

Re: Map of stations that have non-oxygenated gas
 

The oxygenate used in our fuel is ethanol, which doesn't really hinder performance hardly at all or make the fuel burn faster, anyone who says it does is misinformed or mistaken.It does make the fuel burn with slightly less emissions and helps prevent water in the fuel.It also will slightly alter stoich by a few tenths and cause a very minor loss in power, but since the octane rating is higher and alchohol fuels are far more efficient than hydrocarbon fuels, you can turn the boost/timing adv UP a little to more than make up for the power/MPG loss.The slight difference in stoich will be compensated for by ECU in closed loop and will run a few tenths leaner in open loop, not a problem and definately not worth going out of your way for non-oxygenated fuel.

Re: Map of stations that have non-oxygenated gas
 

The difference is that this is California fuel, they add something else besides ethanol, which doesnt add to the Octane Rating. The maximum i have seen for Octane rating at a regular gas station is 91 octane. I know most gas stations in MN are 92 or 93. not here

Re: Map of stations that have non-oxygenated gas
 

MTBE?