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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

This month's deals on wheels: 3 cars with incentives, rebates

On television, they come at you rapid-fire: truck deals, car deals, SUV deals. You don't have time to read the fine print, and many sound too good to be true. What follows are three deals that are both good and true. And check out our entire list of incentives and rebates. VOLKSWAGEN JETTA: With Dieselgate winding down and VW's all-new three-row SUV – the Atlas – winding up, Volkswagen is selling sedans with incentives. The Jetta remains VW's bestseller in the US. If you're looking for an immodest deal on modest transportation, you can do worse than a lease on the 2017 Jetta S. THE DETAILS: Purchase at 0.9% APR (no down payment required, available on new 2017 Jetta models financed by Volkswagen Credit, participating dealers only). At that rate, you could save $1,600 over the life of a loan. Offer ends May 1, but given the tepid market interest in sedans, incentives will probably continue through the balance of the model year. NISSAN TITAN CREW CAB: While some buyers will wait for Nissan's recently announced Titan King Cab, and commercial users will grab the regular cab and 8-foot bed, we'll recommend a lightly optioned 4X4 crew cab with standard V8 power, California-penned sheetmetal and a made-in-America footprint. Nissan's full-size pickup is finally a credible competitor in the pickup segment. THE DETAILS: With $3,500 cash back, on top of whatever deal you negotiate, Nissan is effectively reducing the window sticker of a Titan S crew cab by almost 10 percent. MITSUBISHI OUTLANDER: Some cars show up on buyers' radar, some don't. Some aren't anywhere near the radar room. Mitsubishi's Outlander is one of those. But that doesn't diminish its basic attractiveness, especially for young families looking for an affordable three-row SUV with responsive power and competitive features. Add one of the industry's longest warranties and a compelling deal, and you suddenly have reason to track down a Mitsubishi dealer. THE DETAILS: It couldn't be simpler – negotiate your best deal on a 2017 Mitsubishi Outlander, and then receive a $2,000 rebate; on a remaining 2016, it's $3,000. We'd select a fully-equipped GT 3.0S – AWC, which hooks Mitsubishi's V6 to a conventional automatic (vs. a CVT on lower-priced models) and all-wheel drive. That's a window sticker of about $34,000, and you can count on an aggressive posture by the dealer to get your business. Mitsubishi Nissan Volkswagen Car Buying Buying Guide Truck SUV Sedan

Here are the best-selling cars and trucks from January 2015

Every month, Autoblog slogs through all the sales figures reported by automakers that do business in the United States, and, after a little bit of sorting, we put it into an easy-to-read chart in an attempt to make it as easy as possible to follow the ins and outs of sales and shipments. But that only covers the brands themselves, not the individual models they sell. And we think you'd all be interested in knowing which vehicles beat their rivals in sales from month to month, so we've put together this handy gallery to keep you in the know. While the leader of the pack may not come as much of a surprise, the order that the top ten finishes in changes frequently – due to automaker deals, the price of gas, etc. – and we've included some statistics to help you see how their current performance stacks up to month's past. Click here to see January 2015's Top Ten Best-Selling Cars And Trucks In America. By the Numbers Chevrolet Ford GM Honda Nissan RAM Toyota Car Buying