Fuel economy edges up

The WardsAuto Fuel Economy Index rose slightly for the first time in four months in July, as market share moved to small cars and to Asian automakers.

The average fuel economy of light vehicles sold in the U.S. was 23.7 mpg in July, up from 23.6 mpg in June, and a 5.3% rise from a year ago. This years record was 24.1 mpg, in March.

Kia topped the list for the first time, followed by Toyota, Hyundai and Volkswagen.