Boeing Co. (BA) has raised its expectation for improving the fuel efficiency of its updated single-aisle 737 Max jetliner to 14%, up 1% from its most recent goal.

Boeing is riding a wave of demand for more fuel-efficient jetliners from airlines who covet every ounce of fuel savings after more than a decade struggling under the weight of fluctuating energy costs.

Boeing has completed internal design audits on its updated jet which will make its first test flight in 2016 and said the integration of the engines and aerodynamic technologies allowed the plane maker to increase its efficiency target. Keith Leverkuhn, vice president and general manager of the 737 Max program, said on flights of six-hours or more, about 3,000 nautical miles, the efficiency improvement will improve even more by around 2%.

Mr. Leverkuhn said the jet, which adds new engines from CFM International, system updates and extensive aerodynamic improvements, is on track to be delivered to Southwest Airlines Co. (LUV) in the third quarter of 2017. CFM is a joint venture between Safran SA (SAF.FR) and General Electric Co. (GE).

Boeing 737 Max chief engineer Michael Teal said that efficiency boost provides airlines an 8% operating costs advantage over its Airbus counterpart, though both plane makers claim an efficiency advantage over the other. Airbus is a unit of European Aeronautic Defence & Space Co. (EADSY, EAD.FR).

With around four years to go before it delivers, Boeing has already secured more than 1,600 orders for the jet from 28 customers, around twice as many as it had accumulated when it first delivered its last major update for the 737 in late 1997. Airbus, which launched its A320neo or new engine option, has received nearly 2,400 orders for the jet, continuing a pitched battle between the two jetliner rivals for market share for its highest-volume programs.

Boeing is increasing production of its current generation of 737 to 42 jets per month next year, a record rate, and Mr. Leverkuhn said as the company transitions to the 737 Max the company's current production facilities in Washington state are sufficient to meet current demand, expected to go even higher, and wouldn't require new assembly lines that could potentially be outside of its traditional manufacturing base in the Northwest U.S.

"With whatever [production] rate demand we've got...we're capable here in Renton in managing that," said Mr. Leverkuhn of Boeing's suburban Seattle factory.

The Wall Street Journal reported Monday Boeing was evaluating its North Charleston, S.C. base as a potential production home for its long-range 777X aircraft, which would enter service with airlines around 2020.

Airbus also announced Tuesday it had surpassed 10,000 orders for its A320 jetliner, the 737's direct competition. The milestone comes little more than a year after Boeing announced it had received its 10,000th order of all 737 models since the 1960s, despite Boeing's two-decade head start.

Write to Jon Ostrower at jon.ostrower@wsj.com

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