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If it's a sailplane specifically designed for that type of use, yes. Sailplanes have L/D ratios from 20 to 50, so can glide for a long time.
If it's a conventional airplane with maximum L/D about 10, then there is no benefit to P&G. On these airplanes the engine is designed to run at its best efficiency point in normal cruise. The efficiency is lower at climb power than at cruise power. Also, the FAA expects the VFR pilot to maintain a constant altitude, and requires the IFR pilot to maintain constant altitude.
My commercial pilot license was current until I decided to quit flying earlier this year. And the C172 is sold, so no more temptation to fly just one more time.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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