Big trucks just aren't appealing enough on their own, at least in some places. For proof, look to a Shanghai GMC dealer who is offering about three years worth of free gas to anyone who buys a new Sierra Denali. Too bad it'll take about 20 years to pay off the big truck.

The dealer is giving away five tons - about 2,000 gallons, worth around $8,000 in China - of petrol to new Sierra Denali buyers in China's largest city, according to The Detroit Bureau. The offer appears to be a nod to rising China gas prices, which are climbing towards levels similar to those in the U.S. now that the Chinese government is doing less to artificially keep gas prices down. Full-size trucks have been sold in China for about three years and are known to be status symbols in China, says The Detroit Bureau.

There is, of course, a catch. The Denali, unlike most General Motors vehicles sold in China, is built in the U.S., so the price tag is about $134,000, or almost three times what the model sells for in the States. Here's hoping a few free car washes come with those full tanks.