On 22/07/2011 2:44 PM, Dieselhead wrote:
Regular here is 89 octane, and all the MB gassers I ever put it in are
just fine. Most other states have 87 as regular, and that has worked
just fine too. Carbureted or injected.
Of course it does contain 10% pure corn likker, so that causes your
chrome plated Relly to melt down, but I find the car runs just fine
without it. It causes no cosmetic or operational damage when it
melts. Therefore it could be called a useless appendage.
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Anyone ever actually compare regular vs premium?
I have heard people say for a long time, that some vehicles will get
much better fuel economy running premium fuel.
They claim that the increased mileage offsets the cost of higher priced
fuel.
I knew a fellow who drove a big old Caddie that swore his fuel mileage
dropped dramatically when he used regular fuel.
I have never tried to document any difference personally.
I have always run the lowest octane that seemed to behave. My old
Suburban used to ping pretty bad on regular so we ran midgrade for a
long while.
I wonder if one might find that a newer MB designed to run on premium
fuel might suffer a significant drop in fuel economy if the computer
adjusted things like timing to avoid knock.
Randy
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