Shell Petroleum is a Dutch company.
BP is British Petrleum, they also own Castrol oil.
Marathon, I thought was a MI company but maybe not, I dont see them any where but Michigan and their refinery is in Detroit.
But I could be wrong on who owns them, if someone can figure it out I am open to correction.

 

I only use premium from Quick Trip, Exxon and Chevron. QT always has the best price. Today it was 2.68.

 

We have Marathons around NC and SC, they are rare, but ive been a handfull on vacations and such. They are only in 17 states and they start up in MI and come down through the east coast (minus a few states) and go as deep as TN.

 

Their TV commercials say "An American company serving America"
So 17 states, all right then.

 

Spike was close -Marathon is a major oil company, began in Findlay, Ohio and is now based in Houston where a real American Oil Company should be. Seven U.S. refineries and world-wide exploration and production operations.

 

Marathon is actually based out of Texas but has operations all over the world. They were a customer for the oil field company I worked for so I had to go through their orientation/safety training.

I usually use Shell premium because it gives me the best power and mileage and is the closest gas station to my house. I have run all grades of fuel through my Rover and it just drinks it down and keeps going without a complaint the way a Rover should.

 

I guess i'm the only one that uses Hess 93... Johnny 5 seems to enjoy it.

 

Yeah, kinda like Harley's huh

Theres a difference between usta was and still is. I lived in Northern Maine for a good bit and we had Marathons there and in Canada. Been to Quebec a few times and they are there also. Spike, although I can be, I'm not trying to be a ***** here, just passing on what I've seen.

Cheers

Robert

 

Slight correction. Premium fuel actually has slightly less energy content per gallon than lower octane fuel. The rest is spot on- the retarded ignition timing indeed more than offsets the additional energy that lower octane fuel contains to prevent pre-ignition damage.

Wait...ok...one more thing. Detonation and pre-ignition are 2 different things. Pre-ignition is what happens with low octane fuel and would be heard as a ping if not for the knock sensor on the engine retarding the timing. Detonation is a horse of a different color. It's usually caused by a damaged spark plug or protruding heli-coil tab in the spark plug boss that is thin enough to get red hot during operation. It can cause the fuel to ignite even when the piston is just beginning its upward travel. Detonation can blow a hole in the top of a piston no problem.

Dave

 

I reformed my wicked 87 ways too. I figured if my Ford Triton OHC v8's and v10's ran on 87 why not the Rover. The switch to a full tank of Chevron 91 proved to make a difference in drivability that you can feel using the seat of your pants dyno.