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it's a bored TB... you'll flow more air with the same amount of pedal movement. fuel economy should be identical, possibly slightly better with the larger TB depending on how much code in the PCM is TPS dependant.
smaller TBs are much less finicky to drive, when GM went over to the drive-by-wire throttles, they got much larger since the human factor of not being able to depress the pedal to the correct height is removed since now the PCM controls it.
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