With the customers' demand for fuel-efficient cars witnessing a notable rise in the month of March, thanks largely to the soaring gas prices, General Motors (GM) revealed on Monday that its sales during the month were boosted notably by gas-sipping cars.

According to a statement by GM's North America president Mark Reuss, sales of fuel-efficient cars comprised approximately 40 percent of the automaker's sales in March. In fact, the company achieved an environmental landmark of sorts with its US sales of 100,000 cars which are capable of giving 30 miles per gallon (mpg) or more in the highway driving.

As per the details shared by Detroit-based GM, the 100,000 March US sales of fuel-efficient cars - the company's highest ever sales of such cars - was a landmark achieved through the combined sales of 12 of its vehicles which can achieve an Environmental Protection Agency estimated 30 mpg or better on the highway.

Pointing out that three years back, only about 16 percent of the vehicles sold by GM achieved at least 30 mpg on the highway, Reuss said that the automaker has, over the past few years, made increased investments in four-cylinder and turbocharged engines, as well as more fuel-efficient transmissions and hybrid and plug-in electric cars.

Noting that most automakers have lately been doing a good job in terms of meeting the consumers' increasing demand for fuel-efficient cars, TrueCar. com analyst Jesse Toprak said of GM in particular that the company has "made a complete turnaround where fuel-efficiency is now a priority compared to just a few years ago."