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Try a prestige car from Europcar before you buy. Or you could just go to a dealer.

You can hire a BMW 5-Series (pictured) from Europcar before you buy It’s always good to have a promotion to get punters through the door, but the latest PR promo from Hertz does seem to have a very visible flaw in its logic. According to Europcar – the leading car hire company in Europe, don’t you know – the best route for trying out a new prestige car before you buy is to give them a call and book a day or three in the cars of your choice. Europcar say you can have anything from a 4×4 to a luxury saloon and performance cars, with the suggestion you can pit a Mercedes SLK against an Audi TTS or check out the differences between a new E-Class or new 5-Series.

Winners and Losers: Porsche sales pop in April

Porsche sales spiked 82 percent in April and are up 46 percent for the year, parking the luxury automaker among the top five winners so far for 2011. The redesigned Cayenne made the biggest contribution, with sales up an eye-popping 384 percent from last April and 141 percent for this year. Porsche counted 1,578 copies of the Cayenne sold in April, versus 326 the year before.

General Motors to keep green car technology in house

For the first time in its 100-year history, General Motors plans to design, develop and manufacture electric motors for its growing array of gasoline-electric hybrids and electric vehicles. The electric motors used in GM's current lineup of hybrids are made to GM specifications by outside vendors. GM wants to bring the design and manufacturing in-house to save money and to apply its own technology to boost performance, lower weight and reduce power consumption, said Larry Nitz, GM's chief hybrid powertrain engineer.