Filled up yesterday. $2.199 for 87 E10. 575.6 miles , fcd = 64.5 x .943 = 60.8 MPG. Today , 37 deg F in Naperville , 38 in Elk Grove. 35.0 miles, fcd = 60.0 x .943 = 56.6 MPG. Started out with a very low battery ( 2 bars ) because I did something dumb yesterday , something I haven't done in a long time. I was distracted when I arrived at home yesterday ( attractive woman parked in my driveway ) and when I backed the car into the garage , I left it in Ready Mode. I hate when that happens ! My trip A , which had been at 70.0 MPG , 5.6 miles , plummeted to 33 MPG. The car was in ready mode for almost five hours. Ouch. After driving to work , Trip A was up to 53 MPG.