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2004 GMC Savana Passenger (dedicated CNG) — 6.0L 8-cyl, Automatic 4-spd, RWD

This 2004 model was originally EPA-tested under the pre-2008 2-cycle method, which didn't account for highway speeds over 60 mph, air-conditioner use, or cold starts. When EPA overhauled the test for model year 2008, city ratings fell by about 12% and highway by about 8% on average industry-wide — and EPA retroactively adjusted every 1984-2007 rating to the stricter standard so old and new cars could be compared fairly. The MPG above is already on that modern scale — the window sticker on this car when it was new likely showed a higher, pre-2008-method number.

EPA fuel type: CNG · class: Vans, Passenger Type · engine: 6.0L 8-cyl · transmission: Automatic 4-spd · drive: RWD · MPG retrieved 2026-07-24.