Quote:
Originally Posted by wdb
It's already been shown that the Fit does indeed advance timing further when burning 93 octane than it does when burning 87. However the tests were performed at WOT, so there is still some question as to the benefit of higher octane under normal driving conditions.
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If I can get the software sorted out (working on it now), I'm gonna log some 93 octane runs today . . . Hopefully be able to get some consistent part-throttle runs in as well as WOT. Gotta find someplace to do it, though. Then I'm heading on a trip tomorrow, so I'll burn through the rest of the tank & put 87 back in. Test w/ the 87 & repeat next weekend.
I feel I should repeat, though - just because ignition timing advances with the higher octane, that doesn't necessarily mean the engine is making any more power, or running any more efficiently.