During our week with mixed highway and city driving we averaged 30 mpg. (thetorquereport.com)
Display on Felix Kramer's Chevy Volt after a January 2011 morning of mixed highway driving. (calcars.org)
Cylinder deactivation and a steady right foot helped eke out an 18.3 mpg average over my week with the «Burb, which was over mixed highway and city conditions. (speedsportlife.com)