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daverbmxer,
i opened a thread with the same question. -- i already had my VAC gauge installed.
i did find conditions, like a highway on-ramp, where the lower gear yielded better vacuum.
i have an automatic transmission, so lugging is pretty unlikely to happen, but i come close.
the only reasonable response i received was old tele man's response.
my vehicle is too old for a scanguage to compare these gears, but i think he made great sense.
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