WASHINGTON -- Automakers have been slow to deploy electric vehicles, but they are rapidly redesigning gasoline-powered cars to save fuel, a survey by the EPA shows.
The annual report, released last month, estimates that average fuel economy in real-world driving climbed to 23.8 mpg for 2012-model vehicles, up 1.2 mpg over 2010 vehicles.
One of the biggest drivers was the use of technologies such as gasoline direct injection, the report shows.
Use of direct injection in light vehicles more than tripled in that period, according to the report.
An estimated 30 percent of 2012 model vehicles had GDI, compared with 9 percent of cars sold in the 2010 model year.
The technology can reduce fuel consumption by 15 percent, according to Robert Bosch, which supplies valves and pumps for fuel injection systems.
Over the same two-year span, the share of cars with turbocharged and supercharged engines rose from 4 percent to an estimated 10 percent. And the share of cars with six-speed transmissions nearly doubled, from 33 percent to 61 percent.
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