dgrant3830

I'm a bit more mystified about the gas than detergents. I drive a lot of miles each day, therefore I buy a lot of gas. When I buy Chevron, I average 27mpg. When I buy Sam's Club, mileage is down to 24 right away. Now Sam's doesn't state on their pumps if its got ethanol in it or not. I've tried Arco and sometimes good mileage and other times not. All we can get out here is 91 octane but I'm starting to wonder if they are putting 87 into the ground tanks and not telling the stations... or... are the refineries somehow diluting the gas? Chevron is the highest cost here but it works the best too. Shell now adding nitrogen to the gas, I have not tried, but nitrogen itself doesn't burn in any way, so not sure what they are claiming as opposed to what they are saving by reducing the amount of energy in a tank of gas?

VettedCandidate

OK, so what additives would/do you use if you have no TopTier gas nearby??

FortMorganAl

The same one that used to be in most of the Top Tier gasses - Techron.

VettedCandidate

I have wanted for a long time to have a simple test (like a test strip or something) that would clearly indicate what octane a gasoline has. Someone could make one hell of a lot of money if they could come up with that one!

LS WON

Each batch of gas is different even within the same company. They also change their blends in summer and winter times so who knows?

carnut08

There's a reason that many manufacturers have specified Chevron gasolines for emissions certification for years! In fact before it was available in the Detroit area, it was trucked in from western states.

Believe what you want, but there's more to this than meets the eye.

Have you ever read a newspaper article with statistics in it which were either misquoted or misrepresented? That's because writers are writers. They're generally poor statisticians and even worse engineers.

I'd wager that the articles mentioned above were not written by petroleum engineers.

gsport

confused..... i'm so confused

shopdog

There is a simple test, the same test you use to check antifreeze concentration or state of charge of a lead-acid battery. That test is to measure the specific gravity of the fuel. Premium has a lower specific gravity than regular in direct proportion to its octane content.

Vette Suspension

It really is quite simple. You can believe a web site or a few members that state TOP TIER gas is snake oil and take the chance and put it in your tank. Or you can read the owners manual and follow it. For VC he should most likely ad the techron to his gas. Or even try contacting Bowling Green or the Corvette action center for advice.

For some reason whatever it may be GM has recommended TOP TIER gasoline. They also recommend synthetic oil, Mobil 1 and that your tires have 30 psi. You can pick and choose what you want to follow in the manual or follow it thoroughly. For some reason I have a feeling GM knows a bit more then a few members or some article.

It is not as if the TOP TIER gas is $1 more a gallon. For me it's usually 2-9 pennies a gallon. For piece of mind I get it. You can chance it and put in any gas you choose. Most likely nothing will happen. Is it worth taking that chance? That is your decision.

For those that believe Shell and others are selling snake oil or it's a scam start a class action lawsuit. Put your money where your mouth is. Call some law firms and get the ball rolling. If it is truly a scam or snake oil some greedy attorney will bite. Or contact a consumer protection agency and place a complaint.

Red Cell

Red Cell.

need-for-speed

I would tend to agree.

GCD1962

I can't believe so many as still buying into the "top tier" gimmick. Plain ans simple it is nothing but a marketing scheme riddled with a lot of false information.

Radioman

I go with the local Citgo because they have a Touchless Car Wash...

Vette Suspension

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need-for-speed

C6~Missle

I agree... A perfectly legal scheme.. but seems like a scheme none the less. It may have had good intentions starting out.. but now it seems much about the industry is standardized and with only minor differences in the product.. We should all be used to re-branded items all formed from commoditized sources yet yielding different prices because of brand labels..etc. same thing, different product.

VettedCandidate

OK, what is the specific gravity of 93 octane?

VettedCandidate

You are a lawyer?

RULEMKR

Daytona Bob

I hate gas threads.

C6 Missile is right...

http://forums.corvetteforum.com/1570260251-post38.html