Shares of the oil and gasoline refiner tumbled as much as 6% early Tue., although they recovered much of that later in the day, after it surprised Wall Street with lower-than-expected Q4 earnings after announcing a 50% dividend hike and special dividend Wed. The bar was set high. HollyFrontier (HFC) had previously reported 6 quarters of double- or triple-digit profit growth. EPS jumped 92% to $2.03, missing by 23 cents. Revenue grew 3.5% to $5.15 bil, topping views for $4.93 bil. Shares fell 0.6% to 54.30 .