did you check your maf signal and it's sensor temp? usually it's because the temp sensor failed and the car thinks it's -20 outside. by math since my 4.7 uses 0.55gph at idle at 600, i would think an e85 4.0 and 750 would use around 0.8ish on e85. check all of your sensors. one of these has to be wrong. the quickest way is to sniff the tail pipe with a wideband and see if it's rich.
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