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" There&amp;#039;s faint ticking noise in the distance and a barely audible whoosh. Must be coming from the car in the next lane, you think. It couldn&amp;#039;t be much closer, and anyway, the engine is remarkably smooth\u2014think a big six with lots of torque. Except that you&amp;#039;re on a two-lane road with no other traffic, and you haven&amp;#039;t stopped for fuel in almost 500 miles. The GLK has been updated for 2013, but the big news is the oil-burning four-cylinder now on offer. It marks the return to the States of the Benz diesel four, and the engine will soon be available in the E-class sedan, replacing that car&amp;#039;s turbodiesel V6. The approach is the cool part. Diesels require turbos to make decent power while remaining efficient. The GLK250&amp;#039;s four has two turbos in series: a small one that spools quickly off idle, and a larger one that takes over at higher engine speeds and loads. This allows the little one to keep spinning, ready to attack, and reduces turbo lag. This layout isn&amp;#039;t new (it&amp;#039;s been seen on BMW and Mercedes diesels, albeit mostly in Europe) and has appeared here before on gas cars (Porsche 959, Toyota Supra) but never on a four-cylinder SUV.  The GLK250 is slightly slower than the gas-powered, V6-equipped GLK350 (7.9 versus 6.4 seconds to 60 mph, according to Mercedes), but it uses a third less fuel. And it&amp;#039;s easily as smooth and more torquey. This is the kind of gas-engine impostory that diesel engines needed so badly. Big, real-world fuel-economy gains and refinement to boot? Welcome back, four-banger.  PRICE $39,495 POWERTRAIN 2.1-LITER I-4, 200 HP, 369 LB-FT; AWD, 7-SPEED AUTOMATIC WEIGHT 4321 LB (MFR)  EPA CITY/HWY 24/33 MPG (EST)  ON SALE Now "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.roadandtrack.com/new-cars/news/a4677/2013-mercedes-benz-glk250-bluetec-4matic-65-1-roa0813/>