I only have one fuel consumption complaint. On cold mornings, it takes a few minutes for the battery system to comepletely fire up. The battery has the ability to recharge through driving and brake regeneration, but it can't get into full EV mode until the system is warm. This leaves a lot of electric miles on the table in Michigan. I live 1-2 miles from the freeway ramp, and I would like to be in full EV during that period.
I doubt this will be a problem with the C-Max Energi. Charging the batteries or having the car plugged in should keep the system warm.
Two other things I noticed:
1) The only scheduled maintenance under 120K miles is oil changes and filter replacements. Oil changes at 10K Miles.
2) The C-Max Energi only has oil changes at 20K miles. Even less maintenance is required. It also has a system on it that keeps oil, even if it hasn't been used in months, from sludging up.