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You might be able to try some things mentioned in this thread: http://hptuners.com/forum/showthread.php?t=4929

Just an update. I've had several fill-ups since my last post, and I wanted to chart my mpg in excel, but cant seem to find some receipts (I calc my mpg every fill up and write it on the receipt).
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I've been cooresponding w/ EC about his pseudo lean cruise and tried it in my Formula. I was averaging about 22mpg with a mix of highway and city. I think the best I've ever gotten has been 24mpg. ...