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These are the top luxury cars bought by people entering the segment for the first time

Let's say you just got a big promotion at work or the kids are moving out of the house, and you finally have some extra money. You decide to blow it all at once and treat yourself by upgrading your ride. Naturally, you look to a luxury automaker. What do you choose?
Models like the Audi A3 and Mercedes-Benz CLA-Class may be tailor-made to introduce buyers to the premium segment, but a new study finds that they don't garner the highest rates of non-luxury customer conquests. It turns out that a Volvo leads among folks moving up to a premium brand, and it isn't even one that's made anymore, at that.
A recent study by Polk and IHS Automotive looked at what models had the highest rates of buyers upgrading from a non-luxury segment. The information comes from its new vehicle registration data through April 2014. All ten top models boasted conquest rates of over 50 percent, but the Volvo C70 led the field with 68.01 percent of its customers coming from non-premium brands.

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.

2017 Infiniti QX30 First Drive

If you've heard anything before about this car, the 2017 Infiniti QX30, it probably has to do with its corporate parents, an odd couple if there ever was one. Renault-Nissan, Infiniti's corporate overlords, inked a deal with Mercedes-Benz to share some mechanical components and platforms. That deal put a new, very modern 2.0-liter turbocharged inline-four under the hood of the Q50 and was the genesis of what you're looking at here. What are you looking at here? We drove this car in 2015, when it was called a Q30 – originally it was going to be the lower-riding counterpart to the slightly jacked-up QX30. Then Infiniti decided it'd make more sense to sell all variants of this vehicle as CUVs in the US, so we have three slightly different flavors of the QX30 instead. There's the normal version; the Sport, which is 0.6 inches lower; and the AWD, which is 1.2 inches higher. Infiniti brought us to Seattle to sample the Sport and AWD flavors on a semi-circumnavigation of the Puget Sound. It didn't rain a drop, thanks for asking, and instead was sunny and mild the whole time. It's easy to make the QX30 sound more confusing than it actually is. This is essentially a Mercedes-Benz GLA250 with full exterior styling and partial interior design by Infiniti, built in the UK alongside several other Nissans. The powertrain and chassis, including the optional AWD system, were all "co-developed" with partner Daimler, with final calibration and tuning by Infiniti engineers. Here's another way of explaining it: Infiniti needs an entry-level car to appeal to new premium car shoppers, and the QX30 is the prescription. It's a hatchback that's been given the mildest of CUV treatments and a lot of marketing descriptors. That's because hatchbacks are sales death in America. In Europe, they'll see right through the CUV posturing and realize it's just a hatchback offered in three different suspension heights. Whatever you call it to make it palatable to Americans, it's a useful little vehicle. This car is mechanically identical to the Q30, so there are some things we can gloss over. Both are powered by a transverse-mounted 2.0-liter Mercedes inline-four. It's a turbocharged, direct-injection gasoline engine, and it sure feels like one. It sounds like a rock tumbler full of nickels and runs out of breath at about 5,000 rpm. All versions make 208 hp at 5,500 rpm and 258 lb-ft of torque between 1,200 and 4,400 rpm – more than adequate but less than thrilling.