As with any vehicle and/or driver, YMMV. Cruze Diesel EPA rated estimates are very easily attained, and often difficult to "bust", in our case. I usually leave the discussion there, as the details start sounding like a fairy tale.

The mileage difference in the same car and essentially the same mixed-driving routes, will vary 5-10% between me and my wife. It's always been that way with several vehicles over the years. With only 7K miles on the car, I think it's still early to establish a good mileage trend, but so far, mileage reports have been nothing short of ridiculous to unbelievable. On a recent trip she took with the car full of passengers and luggage to San Diego (I didn't go), the highway-only mileage never dropped below 50 MPG average over 700 miles. The city driving while there was 38. The trip computer makes it easy to track, and can be watched remotely via PC or the RemoteLink (Onstar) app. It's very detailed and accurate. I quit the pencil/paper calculations some time ago, due to its accuracy.

The car was at the dealer last week for its first service. I'll update with full details in a day or so.