Nissan, presumably helped by big brother Renault, might bring diesel versions of its big trucks and SUVs to the U.S. to combat consumer reaction to high gas prices. The automaker would follow the Big 3 in such a move, although the domestics offer diesel engines as an option more for their copious amounts of useful torque than their gas mileage. We're unclear which angle Nissan would choose to market these diesel-powered vehicles. 

Sales of Nissan's Titan pickup have risen 10 percent so far this year; however, CEO Charles Ghosn cited rising gas prices as a threat to future sales of big trucks and SUVs.

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