Use the lowest octane that does not cause the engine to knock. If the engine knocks, then you need a higher octane. If the engine does not knock, then the octane is high enough and a higher octane will not be better. The miles per gallon will be the same with any octane that does not cause knocking, but lower octanes cost less, so you get more miles per dollar.
Use the type of fuel and Octane recommended by the manufacturer. Most cars only require 87 Octane regular.
Just don't fill up at a run-down gas station. If they're not taking care of the equipment above ground I guarantee you they're not checking the tanks either.
99% of Mustang six-cylinder and V8 models will run fine on 87 octane. If you have a Boss 302, Mach I, or Shelby, they're tuned to run on premium (91 or 93 octane, depending on locale.)
That depends on the engine. Most will run on 87 octane regular.
Do you have the 4.6 V8 or the 3.8 V6? As for performance you wont feel a difference with high octane fuel unless the engine has been tuned for it, If your looking for performance and better gas mileage consider getting a cold air intake.
The higher the octane, the bigger the BANG, but the slower the BANG. So to get the extra energy out of a higher octane fuel, the timing has to be advanced to compensate for the slower ignition. Problem is that for the last 20 years or so, the engine management computer has held complete control over the timing. Back in the day, you could change the timing by just twisting the distributor a touch... Now, most cars don't even have a distributor ...
Put water in it. What's it matter. You will just keep posting this same stupid question over and over anyways!
Big Diesel
