Old, dirty fuel tanker at my local Exxon.

[JHZR2]

Originally Posted By: edhackett
It doesn't force up to 10% ethanol. The performance must be the same in fuels that contain up to 10% ethanol.

Ed


Right from the spec on base fuel. 1.3.1.2.1:

"Contain enough denatured ethanol such that the actual ethanol content is no less than 8.0 and no more than 10.0 volume percent. "

So it effectively mandates a high ethanol content fuel, regardless of what the retailer would desire (which may have a different optimal content based upon price).

 

[edhackett]

You are right. The wording has changed since I last read it more than several years ago. It likely changed with congress mandating certain gallons of ethanol being used, or they may just have clarified the original specification.

Ed

 

[Vstrom]

Originally Posted By: Drew2000


http://m.naplesnews.com/news/2011/may/22/pressure-pump-gas-detergent-Shell-BP-Exxon-testing/


Did anyone else read this?

From the link-
"Paragon tested each of the 10 samples, measuring the residue left when gas is boiled away. This “unwashed gum” serves as evidence of detergent. Theoretically, the more gum residue, the more detergent — and the better the gasoline."

 

[Bamaro]

Originally Posted By: Vstrom
Originally Posted By: Drew2000


http://m.naplesnews.com/news/2011/may/22/pressure-pump-gas-detergent-Shell-BP-Exxon-testing/


Did anyone else read this?

From the link-
"Paragon tested each of the 10 samples, measuring the residue left when gas is boiled away. This “unwashed gum” serves as evidence of detergent. Theoretically, the more gum residue, the more detergent — and the better the gasoline."

Among samples of regular unleaded gasoline (those with an octane rating of 87), Exxon had the highest level of additives (20.0 milligrams per 100 milliliters), closely followed by BP (17.2 mg) and Shell (16.2 mg). Trailing substantially were CITGO (6.0 mg) and Pilot (5.8 mg).

 

[GMorg]

We've covered this before. Top Tier fuel does NOT have to have ethanol. Using the cited section without the context of the entire document can be very confusing. The cited specification (Right from the spec on base fuel. 1.3.1.2.1) is the specification for the base fuel used to test the additive. The additive is being tested, not the base fuel.

The reference to ethanol is for the test specifications. The additive formulation must be shown to work even in the presence of ethanol. Top Tier fuel does not have to have ethanol unless the station is in a region that requires ethanol. The specification for the test method is designed to determine if the additives works in the worst-case scenario. Likewise, the base fuel control allows one to determine if the additive prevented deposits beyond the effects of ethanol itself.