Surprisingly, the run-up in oil prices over the last two years has had relatively little impact on the sort of cars and trucks people are buying. Chrysler, for example, is still struggling to meet demand for its big HEMI V-8, and Ford continues to set records with its F-Series pickup. But despite the seemingly optimistic public pronouncements, industry officials are increasingly worried and wondering whether it's time to ramp up production of small cars, in-line four engines and hybrid-electric vehicles. If consumers start downsizing, it could be bad news for Detroit 's Big Three. But the trend could also be trouble for Japan 's big makers, too. They are, after all, investing billions to develop new trucks - like Honda's big Ridgeline, and Toyota's next-generation Tundra - and plants to build them. If gasoline prices start to stabilize, consumers will likely get used to paying a bit more. But if the current trend continues, it could mean big trouble for the entire auto industry.
