I got 34.2mpg once. I put cruise control on at 78mph for 68mile. on damn near level highway. no wind, no traffic. 79mph got worse and 77mph got worse. My gp was also not modified at the time.
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MAP Intercooler, X-P hot cam, 1.6 comp cam pro magnum rockers, 105lbs springs, TI valve retainers, PRJ fuel rail, SLP Headers, WIZAIRD Cold Air Intake, Cat and u-bend delete, 3inch pacesetter exhaust, front and Rear GM Perf. Sway Bars, GM Perf. Rear Trailing Arms.