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i believe the 7.3 is an errata to their original 7.1 claim. most magazines were having a damn near impossible time hittin the 7.1 mark, i think only once or twice they got it...so lexus raised the claim. maybe if the magazines tried it after disconnecting the negative wire for a couple minutes, then driving it hard for a bit...i hear that ups the performance because of our "intelligent" drivetrain which learns the style you drive, then adapts accordingly
 
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