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My car easily got 28mpg highway (with hills). This was with stock fuel/ignition/twins/ports, rx7.com chipped ECU, and almost every other bolt on.
I'm sure the intake, DP, MP, and catback actually helped highway mileage.
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'93 RX-7 (GT3574 track toy)
'74 Triumph TR6 (weekend cruiser)
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