GMC Flex Fuel Vehicles

Factory FFV models

Still producing FFVs in 2026

One of only three brands still selling new flex-fuel vehicles

GMC's flex-fuel story is essentially Chevrolet's, because every GMC FFV shares a platform and powertrain with its Chevy twin. The Sierra 1500 5.3L V8 has been FFV since 2002 and remains in production as a flex-fuel truck for model year 2026, alongside Chevrolet. Peak GMC FFV availability ran from 2009 through 2016, when the Sierra 1500, Sierra Denali, Yukon, Yukon XL, Yukon Denali, Savana vans, and the compact Terrain crossover were all offered with flex-fuel capability.

The Sierra Denali was GMC's unique flex-fuel flagship — from 2009 through 2014, the 6.2L V8 (L9H and L94) in Sierra Denali, Yukon Denali, and Yukon XL Denali was a factory FFV, a combination of luxury-truck trim and E85 compatibility that neither Chevrolet nor Cadillac offered quite the same way. Today the FFV offering narrows to the Sierra 1500 with the 5.3L V8 in current production, making GMC the second of only three brands (Chevy, GMC, Buick) still selling new flex-fuel vehicles in the United States.

GMC flex fuel models

Model	Year range	Engine	Notes
Sierra 1500	2002–present	5.3L V8; 4.3L V6 (2014–16); 4.8L V8 (2012–13); 6.0L V8 (2014–16)	Still FFV for MY2026
Sierra Denali	2009–2014	5.3L V8; 6.2L V8	Denali 6.2L FFV window
Yukon	2002–2016	5.3L Vortec V8; 6.2L V8
Yukon XL	2002–2016	5.3L V8; 6.2L V8
Savana Van	2007–2016	5.3L V8; 6.0L V8; 4.8L V8	Fleet/commercial
Terrain	2011–2016	3.0L V6; 2.4L I4; 3.6L V6	Sibling of Equinox

GMC-specific E85 tips

Sierra and Silverado are engineering twins.

Everything written about Chevrolet's 5.3L V8 FFV applies verbatim to the Sierra 1500. Used-truck buyers can shop both nameplates interchangeably; the FFV capability, VIN codes, and yellow gas cap convention are identical.

The Denali 6.2L FFV is a collector's sweet spot.

From 2009 to 2014, Sierra and Yukon Denali trims offered the 6.2L V8 with factory flex-fuel capability. These trucks are increasingly sought after for E85 tuning because the combination of direct-injection-friendly cylinder heads, 403 horsepower, and OEM FFV hardware makes them easier to optimize than later 6.2L variants, which lost FFV certification.

Yukon and Yukon XL FFVs ended in 2016.

When GM redesigned the full-size SUVs for model year 2021, flex-fuel capability was not carried over. If you want a GMC three-row SUV that runs E85, you will be shopping the 2007–2016 window, most commonly with the 5.3L V8.

The Terrain was GMC's only compact FFV.

From 2011 to 2016, the Terrain (a twin of the Chevy Equinox) offered 2.4L four-cylinder and 3.6L V6 flex-fuel engines. GMC has not produced a compact crossover FFV since. If you want a small GMC that runs E85, a used pre-2016 Terrain is the answer.