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Can you explain the 5th gear misfiring, and also post your Dyno graph with air fuel on the e85, I'm curious to see it.
That 60 foot is amazing for a boat, most purpose built cars would be jealous of that.
Also as far as race gas and e85, timing needs to be added to really see the benefit of either, and the factory computer needs time to adapt and feed timing back in that was previously removed by the knock sensors. If you have an aggressive tune, you will see a benefit from race gas as it will handle more timing, but if you have a conservative tune with lower timing, race gas will typically hurt your performance. E85 adds a great cooling factor, however the computer takes time to adapt to the different fuel ratios required so be careful you're not running extremely lean by going 70% e85 while its learning and feeding more fuel in to compensate.
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