(FORTUNE Magazine) – When it comes to buzz, hybrid cars are sure getting a lot of mileage these days. Some 136,000 hybrids from Toyota and Honda have been sold to date in the U.S., and Toyota reports customers waiting up to ten months for one of its popular Priuses. Manufacturers are expected to introduce another 18 hybrid models over the next three years, and customers are already putting down deposits. This fall Lexus will debut the RX400h--the first luxury hybrid SUV, which has V-8 power and V-6 fuel economy. Still, don't look for hybrids to rule the road anytime soon. J.D. Power figures that fewer hybrids will be sold this year than Ford F-Series pickups are sold in a month. And even looking out to 2008, hybrids will represent only about 2.3% of the total light-vehicle market. --Alex Taylor III