Premium vs. Regular?
#11
Re: Premium vs. Regular?
Originally Posted by Archslater
As someone previously noted, when a car's engine fuel management system is designed to run on regular, premium will not help. The computer will actually retard the spark to cancel out the faster combustion of the higher octane fuel.
Last edited by Schwa; 06-12-2006 at 05:17 PM.
#12
Re: Premium vs. Regular?
Definitely not a scientific study, but on a recent road trip I was "forced" to use 89 octane in my HAH. (It was cheaper than the 87! ) I went from getting 37 mpg to 35 mpg. The roads seemed the same, as well as the ambient temperature, and elevation changes. But, I have no way of knowing for sure if the higher octane is the cause of the 2 mpg drop.
Also while on this trip, I used 86 octane with no noticeable change. One station even had 85! I stayed away from that stuff. The HAH is rated at 86+.
Also while on this trip, I used 86 octane with no noticeable change. One station even had 85! I stayed away from that stuff. The HAH is rated at 86+.
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