Quote:
Originally Posted by Tim K
The bottom line is pretty simple....
Use what the manufacturer recommends. They are telling you what the engine was designed to run on. Using anything else will likely have a negative effect on both your performance and fuel economy.
(I'm sure someone somewhere will post that in THEIR car THEY got better performance using a different fuel rating than recommended. In reality, your car will run best on what is recommended unless there is a problem with your vehicle...in which case the right action is to get it fixed not change fuel rating.)
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This is all assuming the manufacturers are giving you a number from the engineering group. Marketing can always have a say in the number if they feel it is in the best interest of the company to market the car at a lower octane level. The engineering group will sign off saying it can be tuned to the lower octane level but actually can perform better at the higher octane level. I believe the Prius engine (atkinson cycle engine) is such a case.