What gas do you suggest for a C5?

[Mark Dalton]

You're not kidding! With gas prices where they are it'd almost be cheaper to fly.

 

[MADN3SS]

Anywhere, at least in Palm Beach County, you go you will find that Shell (which I use) is always the most expensive gas. In addition a lot of Shell stations show a differential of $.26 to $.28 between the regular and the premium.:toetap05:

I went to a Sunoco yesterday that was $.30 difference between regular and premium. Pissed me off. I went somewhere else.

 

[MADN3SS]

We have a trip planned to Maryland next month and I hate to think what the price tag is going to be on just getting there and back.

We made it to Kentucky and back on 4 tanks of gas. Not including the gas we bought while driving around town. It was actually a little less. It would have cost us more to fly and rent a car. 700 miles and change each way.

 

[00 NBFRC]

The owners manual says 91 octane. It really depends on how you drive the car. I know an old guy who has a C5 A4 and he puts 87 in with no knocking issues. The computer in the car will change the timing based on the octane of the fuel.
All the base gasoline is the same. What makes it different is the additive package. Those formulas are added when the fuel is pumped into the tanker for delivery.
The highest octane you can buy in California is 91.
If you are not getting 8 gallons per minute when you are at the pump, stop pumping, the filters are dirty and you could have problems.
Fill up at the coolest part of the morning because the fuel companies measure gas volume at 60 degrees. If you fill up a 20 gallon tank at 90 degrees, you are loosing .4 of a gallon. There is a lawsuit pending on this ripoff now. http://www.cfnews13.com/News/Local/2007/7/8/hot_fuel_causes_heated_debate.html
I generally use Chevron, BP and BJs wholesale on a rotating basis with no issues.
I filled up with BJs premium before a trip to Atlanta and averaged 29.0 mpg driving 75-90.

 

[Rich Z]

Fill up at the coolest part of the morning because the fuel companies measure gas volume at 60 degrees. If you fill up a 20 gallon tank at 90 degrees, you are loosing .4 of a gallon. There is a lawsuit pending on this ripoff now. http://www.cfnews13.com/News/Local/2007/7/8/hot_fuel_causes_heated_debate.html

But if you fill up your 20 gallon tank at 60 degrees, what becomes of that extra 8 gallons of expanded gasoline when the tank reaches 90 degrees? :thinkin:

 

[00 NBFRC]

Good question. Its not 8 gallons its .4 of a gallon out of 20 at high temp. Thats how I understood the article. Ive never had a gas tank overflow on me because of a change of temp. But this does have to add up for them. Its in the billions.

 

[JCswm]

Not a C5 but my C3 runs the best on Sunoco 94 and it seems to get better mpg ......

There IS WATER in Citgo fuel... I can see the bottom of my fuel tank with the gas cap off & every time I bought gas at Citgo there was water in the bottom of my tank!!


I'll bet if you filled your tank to the rim at daybreak and left your car sit at the pump 'till the heat of the day it would overflow

The fuel tanks are underground where temps don't change as much

I'm sure the Gas company's are screwing us every way they can

 

[Rich Z]

Back in my high performance days with my '66 GTO, I used to use Sunoco 260 all the time. Finally got a new Sunoco station that opened up fairly nearby, so I may try some tank fulls to see how my C5Z likes it. Just not a lot of those stations around these parts, it seems.... :shrug01:

 

[Kap142]

Amoco Ultimate. 93 oct. pretty much only and I'll throw in a bottle of boost 104 every now and then.

Ken

 

["Backyard Mechanic"]

I use Lucus products in her,fuel cleaner and oil treatment,have been for years,Great stuff.I only put 91 or higher in her when it's cheap enough,normally just 89 octane.Mobile 1 Sys. oil,but the next oil change I will go to redline oil.use it before in other cars,Great stuff:thumbsup:

 

[98 softtail]

I use Lucus products in her,fuel cleaner and oil treatment,have been for years,Great stuff.I only put 91 or higher in her when it's cheap enough,normally just 89 octane.Mobile 1 Sys. oil,but the next oil change I will go to redline oil.use it before in other cars,Great stuff:thumbsup:

Rob, I have also been using Lucas products since Jed Clampett discovered black gold. Here is something to think about tho. I stumbled upon a link that compared several different oil brands, Mobil 1, Q-State, Pennzoil, Valvoline,and some others that I didn't recognize. They did a friction wear test, which they lubed a spinning metal die and applied pressure to it until some point when the lube or metal failed. Sorry I am not exact on these measurments but I didn't think I was going to do an essay on it. Anyway, long story short, to my surprise, Valvoline Durablend was the HANDS DOWN WINNER. Over Royal purple and Redline, Mobil 1 and Q-State. Synthetic or conventional.

While the friction wear marks on some other name brands was as much as
5mm wide, the wear mark on the Durablend was 0.5mm. That impressed me.

So now what to do with this case of Q-State Syntec 10w-40? Well my lawnmower needs an oil change and the two trucks will need em soon....

Joe B.