I was experiencing mild detonation (5.4, 3.55 LSD, 46K miles, 87 octane, airbox mod) and decided to reset the ECU by disconnecting the battery for a half hour. Two things happened after that: (1) indicated mileage increased from the high 14's to the mid-18's, and (2) the detonation went nearly away. My questions are: does the ECU recognize fuel octane, and would my knock sensor be the cause for the detonation? Thank you.

 

Expy.......read the "octane challenge" under engines. Great information>

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97 F-150 4.6 auto, 4x2, 3.55 LS, trailer tow pkg, Air box modification with K&N, Dynomax Super Turbo exhaust.
Oh yeah, it's Oxford White with crome wheels, Legacy shell & custom grill, mlaugh-Meridian, Idaho.