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I was hoping there was another fix besides a software update I could do myself. I did fix my average mpg reading to be more accurate using the Engineering Test Mode.

My mustang would never show higher than 30mpg for instant mpg, even coasting down a hill, even though the bar goes all the way to 40. I have even had full tanks get over 30mpg average, but the instant would still never go above 30. My coworker just got a new mustang and hers will peg out to...

This is the process I use to get in ET mode. Get in car. Turn on car. Turn off car, open and close door. Wait for everything to turn off. For me last item is the dome light. Press and hold OK. Press ignition button 5 times and continue holding OK until ET is displayed at bottom right and release...

Do you still have the delay though?

I have the delay issue, but the spray after it starts is fine. I am wondering if Ford just did not include a check valve, and the line bleeds back down every time? I might try to install a check valve and see if it solves the delay for the spray.