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If you plan to have the computer "relearn" and adjust for better fuel quality.... make sure you remove both battery connections for a few minutes AFTER you have put a full tank of 91+ octane in it. Then the computer will relearn and create settings for the better octane in tank.
The Supra 2JZ-GTE is like this where you can put in 100 octane unleaded, remove the battery connections for a few minutes, then reconnect and it allows more boost/timing etc.
How much more power our 4.5i will make with better octane.... and if you will be able to feel it in a 6000lb truck..... who knows?!?!?!
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'97 LX450 triple lock'd, OME 2.5s, 285 MT, MTsliders,4x4Labs bumper, BBGT35R turbo kit
'84 FJ60 OME 2" lift, 33's "Mr. Hanky"
PROJECT: road race RX-7/LS7/T56 575rwhp 10.5@140mph goal
'93 RX-7/LS1/T56 440rwhp/2800lbs 1.13gs 11.41@127.4mph SOLD 
'87 RX-7/Buick GN power - 11.6@115mph R.I.P.
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