GasTankSize
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Buick gas tank sizes

24 models, tanks from 13.2–25.0 gallons. Pick one for every year and trim.

Current models

Enclave2008–2027 · 19.0–22.0 gal Encore GX2020–2026 · 13.2 gal Envision2016–2026 · 15.9–17.3 gal Envista2024–2026 · 13.2 gal

Older models

Cascada2016–2019 · 14.3 gal Century1990–2005 · 15.7–17.5 gal Electra1990 · 18.0 gal Encore2013–2022 · 14.0 gal Estate Wagon1990 · 22.0 gal LaCrosse2005–2019 · 15.7–19.5 gal LeSabre1990–2005 · 18.0–18.5 gal Lucerne2006–2011 · 18.0–18.5 gal Park Avenue1991–2005 · 18.0–19.0 gal Rainier2004–2007 · 22.0 gal Reatta1990–1991 · 18.2–18.8 gal Regal1990–2017 · 15.8–18.0 gal Regal Sportback2018–2020 · 16.3 gal Regal TourX2018–2020 · 16.3 gal Rendezvous2002–2007 · 18.0 gal Riviera1990–1999 · 18.2–20.0 gal Roadmaster1991–1996 · 21.0–23.0 gal Skylark1990–1998 · 13.6–15.2 gal Terraza2005–2007 · 25.0 gal Verano2012–2017 · 15.6 gal

Tank sizes are in US gallons, across every year of that model.