[cwerdna]

This isn't Chevy nor Cruze specific but GM is mentioned...

Your Fuel Economy Gauge Is Fibbing - Edmunds.com

As gas prices rise, drivers are paying closer attention to the fuel economy gauges that are found in most late-model cars as part of the trip computer. The only problem is that the gauges are inaccurate. In fact, Edmunds testing reveals that one such gauge claimed fuel economy 19 percent higher than the actual result...