Well, I know from experience that my S doesn't like some gasolines. Been using Shell mostly in my old locale. Only one Shell I've found here and it's not conveniently located. I went to the top tier site and perused the retailers. All the Chevrons here have apparently been bought by some outfit called 'Inland'. That leaves Conoco. I've never really thought of Conoco as top tier - anybody had good luck with it? The only other large choice (and there are plenty of them) is BP.

 

We have had good luck with BP, I always thought their quality was high.

 

I'm not sure if Conoco down south is the same as it is up here in north Alabama but Conoco and Chevron are the only places I fill up.

 

We steer clear of BP in central Ohio. Even my service advisor recommended staying away from BP when I was having hesitation/stumble problems. Now I only stop at Shell, unless I have no other choice (problems also "magically" disappeared once weaned off BP - coincidence?).

 

Below is link to Car & Driver Magazine regarding TopTIER Gas:
http://www.caranddriver.com/article.asp?section_id=27&article_id=9752&page_num ber=1[/FONT]

Below is info from TopTierGas.com (funded by BMW, General Motors, Honda, Toyota

Top Tier Detergent Gasoline
TOP TIER Detergent Gasoline is the premier standard for gasoline performance. Six of the world's top automakers BMW, GM, Honda, Toyota, Volkswagen and Audi recognize that the current EPA minimum detergent requirements do not go far enough to ensure optimal engine performance. Since the minimum additive performance standards were first established by EPA in 1995, most gasoline marketers have actually reduced the concentration level of detergent additive in their gasoline by up to 50%. As a result, the ability of a vehicle to maintain stringent Tier 2 emission standards have been hampered, leading to engine deposits which can have a big impact on in-use emissions and driver satisfaction. These automakers have raised the bar. TOP TIER Detergent Gasoline help drivers avoid lower quality gasoline which can leave deposits on critical engine parts, which reduces engine performance. That’s something both drivers and automakers want to avoid. The intention of the TOP TIER Detergent Gasoline standards is to create a winning situation for gasoline retailers, auto manufacturers and drivers. Currently, many gasoline retailers provide fuels with lower-quality additive packages that can build up deposits on fuel injectors and on intake valves. Others can build up deposits in combustion chambers and may lead to intake valve sticking. These lower levels of additives can have negative impacts on engine performance and vehicle responsiveness. Gasoline retailers must meet the high TOP TIER standards with all grades of gasoline to be approved by the automakers as providing TOP TIER Detergent Gasoline. In addition, all gasoline outlets carrying the brand of the approved retailer must meet the TOP TIER standards. Additional gasoline retailers are added to the TOP TIER list as they meet the standards. The retailers known to be on the TOP TIER list are shown below.
Chevron, Chevron-Canada
Texaco
Shell, Shell-Canada
76 Phillips
Conoco
The Somerset Refinery, Inc.
Sunoco-Canada
QuikTrip
MFA Oil Company
Kwik Trip/Kwik Star
Aloha Petroleum
Tri-Par Oil Company
Petro-Canada