Gas/electric hybrids are becoming commonplace in economical cars, trucks, and SUVs. But does the formula work in a luxury sport/utility? Lexus is banking on it, and after driving the RX 400h for two ...

Toyota created a gasoline-electric-hybrid consumer monster, and now it’s struggling to feed it. Since Lexus announced at last year’s Detroit show that a hybrid version of its best-selling RX ...