How much more fuel does E85 need?
Somewhere between about 30% and 45% more by volume, depending on the assumption. A conservative calculation uses BSFC values of 0.80 for E85 vs 0.55 for gasoline, which is about 45% more fuel. Many tuners size with ~30% (gasoline requirement × 1.3). Sizing charts typically run about 19–25% larger injectors for E85 at the same hp. Size injectors and pumps on the conservative side and let the tune set the final mixture.
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