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i actually tried the rig scenario on my way back from somewhere here a couple weeks ago, and i did notice a major change in mpg...it went from whatever it had been (it has been very poor) to about 39 mpg when i was in behind the rig. but i dont have an onboard computer, in fact i dont have any mods at all like that, ive seen suggestions about scangauge, but ive also seen that is terribly expensive.
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