1994 Mercedes-Benz S420Fuel Economy & MPG Ratings

Gasoline Large CarsRear-Wheel Drive

Photo: nakhon100. CC BY 2.0. via Wikimedia Commons

City

MPG

Highway

MPG

Combined

MPG

Trim Comparison

Automatic 4-spd

Premium

City

Hwy

Comb

Fuel cost: $5,450/yr

Trim	Engine	City	Hwy	Combined	Fuel Cost/yr
Automatic 4-spd	Premium	14	18	15	$5,450

Annual Fuel Cost

$5,450

Based on gasoline at $3.67/gal, 15,000 miles/year

5-Year Fuel Savings

$-15,250

vs. average new vehicle

EPA Fuel Economy Score: -1/10

GHG Score: -1/10

Environment

CO₂ Tailpipe Emissions: 592 g/mile
Annual Petroleum Consumption: 19.8 barrels

Specifications

Engine: 4.2L 8-cyl
Transmission: 4-speed Automatic
Drivetrain: RWD
Body Style: Sedan

Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.

Engine & Efficiency Details

Source: EPA fueleconomy.gov

Engine Size: 4.2L, 8-cylinder
Induction Type: Gas Guzzler, Port Fuel Injection
Fuel Type: Premium Gasoline

Annual Fuel Cost by State

Prices as of week ending May 18, 2026 · Source: EIA

National AvgEPA default

$4.490/gal$4,490/yr

California

$5.957/gal$5,957/yr

Texas

$3.888/gal$3,888/yr

Florida

$4.136/gal$4,136/yr

New York

$4.522/gal$4,522/yr

Ohio

$4.510/gal$4,510/yr

Washington

$5.591/gal$5,591/yr

Colorado

$4.618/gal$4,618/yr

Minnesota

$4.344/gal$4,344/yr

Massachusetts

$4.448/gal$4,448/yr

State	Gas Price	Annual Cost	vs. National Avg
National AvgEPA default	$4.490/gal	$4,490/yr	—
California	$5.957/gal	$5,957/yrHIGHEST	+$1,467
Texas	$3.888/gal	$3,888/yrLOWEST	$-602
Florida	$4.136/gal	$4,136/yr	$-354
New York	$4.522/gal	$4,522/yr	+$32
Ohio	$4.510/gal	$4,510/yr	+$20
Washington	$5.591/gal	$5,591/yr	+$1,101
Colorado	$4.618/gal	$4,618/yr	+$128
Minnesota	$4.344/gal	$4,344/yr	$-146
Massachusetts	$4.448/gal	$4,448/yr	$-42