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When my car was heads/cam I did still run E. I had to upgrade injectors to FIC 660s. I also had the DSX flex fuel kit. My car would get 10.5 city driving pretty conservative and 15.5 highway at 80mph.
No idea what pump gas numbers were but with E it made 513whp and 463wtq. The mods were, CAI, PTB, LTH, Ported manifold, M311 heads, FIC 660 injectors, custom grind cam and the DSX flex fuel sensor.
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