For most cars with an oxygen sensor, I don't think extending the injector pulse or increasing fuel pressure is the entire solution. The fuel computer is going to try to close the control loop using the O2 sensor, and it won't read correctly using E85 - the computer is going to retract all the trim and you will end up too lean.
Probably depends on the vehicle, but forget about running closed loop for the best economy.
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I'm not coasting, I'm shifting slowly.
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