the more efficient your engine is, the less fuel it uses, i know its not a supra but my scion has i/h/e and i get on average about 6mpg more than stock. i can get 38 highway and 26-28 city. so free things up abit and you should be able to get better milage
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89 n/a(on her way to being pretty agian)
04 xb(40 shot  , soon to be boosted)
60 ranchero( pure blesphemy dropping in a 2jz-gte going bpu++
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