Take a look at some of Tuesday's midday movers:
Valero fell hard after comments from a company spokesman suggesting that compliance with proposed new EPA pollution standards for gasoline could cost the refiner between $300 to $400 million in new equipment upgrades. Refiners Tesoro and Western Refining traded lower as well.
Hertz jumped after the car rental company raised its three-year financial guidance on strong global demand.
Garmin higher after the company announced in a press release a deal to provide in-dash navigation that would be "fully integrated into Mercedes-Benz infotainment systems over the next four years."
Delta Airlines warned that first-quarter revenue for a key metric would be below prior guidance.
McDonald's traded up to a new 52-week high.
Groupon was lower after UBS initiated coverage of the daily deal coupon company with a "sell" rating and a price target of $4.40 per share.
—By CNBC's Lori Spechler
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