DETROIT (AP) -- Ford Motor Co. is offering free upgrades to U.S. and Canadian hybrid customers to improve their fuel economy.
The company plans to recalibrate the vehicle control systems on 77,000 Ford C-Max and Fusion hybrids and Lincoln MKZ hybrids from the 2013 model year.
Some customers have complained that the cars aren't getting the 47 mile-per-gallon (20 kilometers per liter) fuel economy promised in Ford's advertising.
Ford will increase the maximum speed the cars can be driven in electric mode from 62 mph to 85 miles per hour (100 kph to 137 kph). It also plans to make better use of the grille shutters, which improve aerodynamics; reduce the electric fan speed; shorten the engine warm-up time and minimize use of the air conditioning compressor.