LIUZHOU, China - In this obscure corner of southern China, General Motors seems to have hit on a hot new formula: $5,000 minivans that get 43 miles to the gallon in city driving. That combination of advantages has captivated Chinese buyers, propelling G.M. into the leading spot in this nascent car market.

Compact and utilitarian, these vehicles, called Wuling Sunshine minivans, hardly fit the big-is-better image of G.M., known in the United States for producing some of the largest gas guzzlers on the market, like Hummers.

The minivans, which G.M. builds in a joint venture with a Chinese partner, have a quarter the horsepower of American minivans, weak acceleration and a top speed of 81 miles an hour. The seats are only a third the thickness of seats in Western models but look plush compared with some Chinese cars.

Their development was led by an American, Philip F. Murtaugh, a native of Ohio and a maverick executive who was willing to zig while the rest of G.M. was zagging. Mr. Murtaugh was able to create in China the kind of innovative environment that G.M. has struggled for decades to achieve in its American operations. But whether G.M. can duplicate elsewhere its achievements in China or even keep its pace here is unclear.