Tampa 928s

I have been reading about a lot of stations blending 10% of E-85 with gas but no one really tells you that. Does anyone know which brands offer 100% gas and which ones are blended.

hacker-pschorr

In Wisconsin gas stations are required to label the pumps if any ethanol in in the gas.

I doubt you will find any "brands" since in Green Bay alone there are some Shell stations with 10% ethanol, some are 100% unledded.

The 10% ethanol acts like a good injector cleaner and is higher octane. Not a lot but it will not hurt the engine.

I'm working on the parts to upgarde my 81 to run on 100% ethanol.

Tampa 928s

Rumor has it Marathon has a 10% blend just trying to find the correct gas for the beast!

VehiGAZ

It's not "10% E85," it's just 10% ethanol added to unleaded gas. E85 is 85% ethanol + 15% gas, and is only suitable for "flex fuel" cars... a different animal altogether.

The 10% ethanol additive may clean injectors (dunno about that) but the higher octane rating does not mean what you think it means: "a fuel with a greater number of carbon bonds will carry more energy regardless of the octane rating. A premium motor fuel will often be formulated to have both higher octane as well as more energy. A counter example to this rule is that ethanol blend fuels have a higher octane rating, but carry a lower energy content on a volume basis (per litre or per gallon)." [source]. Octane rating is an anti-knock index, not an energy measure.

The 10% ethanol added to many fuels serves as an oxygenator to reduce emissions per state/local regulations, not because of any benefit to the engine. It replaced MTBE in many places because it is nasty and was found in water supplies. Anyway, the emissions reduction is gained at the cost of power output from your engine. If you can get your gas somewhere where they don't add ethanol, go for it! But for most people, that's not an option.

docmirror

Here is a map of the requirements by county in the US. The legend is a bit cryptic, but if it says Ethanol or oxygenated, it has Ethanol. If it says something else, it may or may not contain Ethanol.

http://www.mobil.com/USA-English/GFM...soline_Map.pdf

In my opinion, the margial benefits of cleaning offered by any Alcohol additive do not outweigh the negatives. Your car will get poorer mileage, lower power, and may damage already old, and crumbly fuel lines. I do not recommend it for any car, and most specifically not for any car built prior to 1999.

hacker-pschorr

When you are running 15 - 20 pounds of boost this is a major benefit (or any boost really).

Reason why many tuners are making their cars E85 compatible.

VehiGAZ

Thanks doc!!!! Nice info.

Oh gee, look at that... I'm taking the 928 to Ulster County, NY this weekend, and they don't require oxygenated gas. Looks like daddy's fillin' the tank!!

If anyone is interested in the different permutations of gas types, there's an FAQ here.

Lizard928

The Megasquirt system has the ability to add a flex fuel sensor and run E85

docmirror

You're welcome. That link is cross linked to the map I showed you. If you haven't replaced your fuel lines yet, contact ROG100 for the kit. Don't have a carbeque.