To adjust for this variable timing, we compared January 2013 retail sales to January 2010.

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Other bullet points for the 2014 Vanquish include an additional 55 horsepower (565 hp at 6, 750 rpm) and 37 pound-feet more torque (457 pound-feet at 5, 500 rpm) over the DBS. Aston's all-alloy 5.9-liter, mid-front-mounted V12 gets a sprucing up with variable timing on both intake and exhaust sides, as well as freer-breathing intake geometry.

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Many cars, including the Mazda CX-5 and Volkswagen Golf, use variable valve timing to maximize fuel efficiency and performance.

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Silverado and Sierra will accomplish its new mileage pinnacle with a 5.3L EcoTec3 V-8 relying on direct injection, cylinder deactivation and variable-valve timing to achieve EPA estimates of 16 mpg in the city and 23 mpg on the highway with two-wheel drive, or 16 in the city and 22 on the highway with four-wheel drive.

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And the IRSseems to be tolerating donor-friendly manipulations of charitable trusts it once would have frowned on, such as investing in variable annuities to game the timing of income.

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The timing of the downgrade was about the only variable outstanding as its inevitability seemed all but assured.

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The trials are likely to be long and difficult: Because of the murky and variable nature of depression, it is difficult to measure antidepressant effectiveness at all, let alone subtle differences in the timing of effectiveness.

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