Quote:
Originally Posted by RedDevil
regular unleaded gas?
Not everybody would agree, especially on a high compression engine higher octane can yield better economy as they tend to ping on regular, forcing the ECU to alter the timing.
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exactly!
When I had the Infiniti Q45, I tested running regular and high on my trips to texas. The ecu would alter the timing and reduce the mpg.
On newer cars (the Q45 was an 02) run what is recommended. THe ECU KNOWS!