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A new patent document published on April 9 by the U.S. Patent and Trademark Office suggests that Ford is eyeing an 11-speed automatic transmission.

The document includes details for three different embodiments of the transmission using different combinations of clutches, brakes and gears. Currently the company has only announced plans for a 10-speed automatic transmission that will arrive in the 2017 F-150 Raptor pickup truck. Ford powertrain spokesman Paul Seredynski wouldn’t confirm that Ford is developing an 11-speed automatic transmission.

“As a technology leader, we submit patents on innovative ideas as a normal course of business. Patent submissions help protect our new ideas but do not necessarily indicate future business or product plans,” he said in an official statement.

Ford is already able to claim an average 20 MPG, which is a two-MPG improvement for the 3.5-liter EcoBoost 2015 F-150 in two-wheel drive form compared to the previous generation equipped with the same engine by shaving up to 700 lbs from the curb weight of the old truck courtesy of an aluminum body.

Ford filed the patent on October 4, 2013.

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