Tesla Motors’ shares have dropped 14 percent in seven trading days on growing concern that the cheapest gasoline in more than four years will dampen consumer enthusiasm for the company’s luxury electric cars.

Tesla fell 4 percent to $214.36 at the close Monday, the seventh straight day the shares traded down, and this afternoon it’s hovering slightly up in the $215 level. The shares gained 42 percent this year through Monday.

Consumers paying less at the pump may have diminished the desirability for vehicles that run on an electric charge and can cost as much as $100,000. Gasoline prices in the U.S. have fallen for 68 days to an average of $2.67 per gallon, according to AAA.

Tesla does not break down its sales figures by country, however some estimates suggest Tesla’s U.S. sales may be falling this year as the company began exporting its Model S luxury sedan to foreign markets. The company said it expects next year to sell 50,000 of its Model S, named last week as top luxury car in owner satisfaction in the Consumer Reports annual buyers survey.

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While many analysts suspect the drop in share price for Tesla is related to the current low price at the pumps, there remains plenty of optimism for the stock long-term.

“We think the weakness provides a buying opportunity,” said Ben Kallo, an analyst with Robert W. Baird Co. Tesla “will continue to see strong demand which is largely driven by performance, quality, and brand”

The current trend on the stock market has not changed the focus many automakers have put on continuing to improve fuel economy and add both hybrids and electric vehicles to their product line up.

When Ford rolled the first aluminum F-Series off the line in Dearborn, MI, CEO Mark Fields was repeatedly asked if it was critical for the automaker to offer a dramatically more fuel-efficient pickup.

“We think the trend is clear,” Fields said. “Over time, we believe gas prices around the world will continue moving higher. When that happens, we will have one of the most fuel-efficient trucks on the market.”

Kallo said buyers of electric vehicles are attracted by the ability to ignore the ups and downs of gas prices.

“Although the recent decline in oil prices has caused concern about EV demand, we believe EV purchasers are focused on the long-term benefit of not being exposed to oil price fluctuations,” he said. “We believe demand for Tesla’s vehicles will remain strong.”