Does the 2004 Chevrolet Express Passenger (Bi-fuel) take premium or regular gas?

The EPA lists the 2004 Chevrolet Express Passenger (Bi-fuel) 6.0L 8-cyl, Automatic 4-spd, RWD as taking flex-fuel. Combined MPG is 12, and at today's gas prices that's about $5,200 a year in fuel.

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2004 Chevrolet Express Passenger (Bi-fuel) — 6.0L 8-cyl, Automatic 4-spd, RWD

This 2004 Chevrolet Express Passenger (Bi-fuel) (6.0L 8-cyl, Automatic 4-spd, RWD) is flex-fuel (gasoline or E85). FLEX-FUEL

MPG combined (11 city / 15 hwy)

$5,200

est. fuel cost / year (EPA, 15k mi)

—

tailpipe CO₂

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: Gasoline or natural gas · class: Vans, Passenger Type · engine: 6.0L 8-cyl · transmission: Automatic 4-spd · drive: RWD · MPG retrieved 2026-07-24.