2025 Gmc Terrain Elevation Release Date. The terrain lineup begins with the 2025 terrain elevation, followed by the 2026 terrain denali and the 2026 terrain at4 — each with its own character and features. Combined gas mileage for the 2025 gmc terrain is 27.

Gmc completely overhauled the terrain for 2025. The next generation terrain lineup starts with the 2025 terrain elevation awd (available fall 2024).