2005 GMC Sierra 2500 HD 4WD CNG

6.0L 8-cyl · 4-speed automatic · 4WD/AWD

Natural gasCNGStandard Pickup Trucks 4WD

Official EPA record #21531 from FuelEconomy.gov · data 2026-07-26 · every assumption below is yours to edit. How this is computed

Per month

$324.59

Per year

$3,895

Per mile

32.5¢/mi

5-year total

$19,475

pickup body style — not this exact model

Notes & official EPA estimate

1,315.9 GGE of natural gas / yearnatural gas @ $2.96/GGEAt $3.96/GGE: $434.25/mo

A mile road trip costs about $97.50 in energy.

Natural-gas MPG is measured in gasoline-gallon equivalents (GGE); the default price is the official national average per GGE.

Official FuelEconomy.gov estimate: $4,950/year — assumes 15,000 miles/year and EPA price assumptions. The figures above use your inputs instead.

Compare with another vehiclePrices: EPA national averages, Jul 24, 2026 — override anytime.

At 12,000 miles per year (55% city / 45% highway) with EPA national-average prices, this 2005 GMC Sierra 2500 HD 4WD CNG costs about $324.59 per month in fuel — $3,895 per year, 32.5¢/mi, $19,475 over five years.Assumptions are editable below. Prices as of July 24, 2026 · EPA vehicle record #21531. EPA figures are laboratory estimates; real-world cost varies with driving conditions, weather, and where you buy energy.

GMC Sierra: running costs for every model year →

Official EPA efficiency

Measure	Value
City miles per GGE	8
Highway miles per GGE	11
Combined miles per GGE	9

Natural-gas economy is measured in gasoline-gallon equivalents (GGE), not gallons of gasoline.

Official EPA estimates

Estimate	Value
Official annual fuel cost (15,000 mi/yr)	$4,950/yr
Tailpipe CO₂	781 g/mi
EPA smog rating (BIN 8)	2/10

Source: U.S. EPA / DOE FuelEconomy.gov, vehicle record #21531 (record updated 2013-01-01). Snapshot processed 2026-07-26; page data last changed 2013-01-01.

View this record on FuelEconomy.gov — includes owner-shared real-world MPG for this vehicle.

Related configurations

Same year, same family

Adjacent model years