2003 Cadillac Seville: MPG and fuel economy

This page collects every fuel-economy figure the EPA publishes for the 2003 Cadillac Seville. Below you will find the headline combined, city, and highway MPG, the estimated annual fuel cost at three different driving levels, the tailpipe CO₂ emissions, and a full breakdown of the engine and drivetrain. If you want to know whether this generation got more or less efficient over the years, the year-over-year table further down covers every model year the EPA has rated.

Fuel economy at a glance

These are the EPA's official ratings for the 2003 Cadillac Seville. The numbers come from a standardised laboratory test cycle and are the same figures that appear on the window sticker of every new car. Real-world mileage varies with driving style, weather, fuel quality, and how heavily loaded the car is.

Combined MPG is a 55/45 weighted blend of the city and highway test cycles. The EPA uses it as the single number you can compare across the entire dataset, including hybrids and EVs (which use the equivalent MPGe figure).

How the 2003 Cadillac Seville compares

The 2003 Cadillac Seville returns 19 combined MPG. Cars in the Midsize Cars class for the same model year average 19.8 MPG, which puts this car behind the class average by about 4%.

The most efficient car in the Midsize Cars class for the 2003 model year is the Honda Accord at 25 MPG. The bar chart below puts the Cadillac Seville alongside the class best and the class average so you can see the full picture.

For broader context, the average new car of the 2003 model year (across all classes) returns 18.4 MPG. Larger vehicles pull the all-cars average down, so do not use that figure on its own to judge a small car or a hybrid. The full list of the most efficient cars of the 2003 model year is on its own page.

Annual fuel cost across driving patterns

The headline annual fuel cost the EPA publishes assumes 15,000 miles of driving per year and a fuel mix of 55% city and 45% highway. The dollar figure is calculated using the EPA's current reference price for regular gasoline, which is $3.99/gallon. EPA updates that reference periodically rather than tracking live pump prices, so treat it as a window-sticker estimate rather than today's pump number.

The table below scales the EPA's number to three common driving patterns. The combined MPG and the reference fuel price stay constant, only the annual mileage changes. To get a current-prices estimate, take your local gas price and multiply by 789.5 gallons (the car's annual consumption at the rated MPG).

Year-over-year MPG for the Cadillac Seville

The EPA has rated the Cadillac Seville across 21 model years, from 1984 Cadillac Seville through 2004 Cadillac Seville. The numbers below are the best combined MPG figure the EPA published for each year, which lets you see when the car was at its most efficient and how recent generations stack up.

Combined MPG has stayed in roughly the same range across the run, hovering close to 19 MPG.

Compare against other Midsize Cars for 2003

If you are cross-shopping the 2003 Cadillac Seville, the most useful comparison is against the other cars in the Midsize Cars class for the same model year. The list below shows the highest-MPG peers, ranked from most to least efficient. Click any of them to open its full page.

The Honda Accord leads this group at 26 MPG, 7 MPG ahead of the 2003 Cadillac Seville.

Specifications

The 2003 Cadillac Seville runs a 4.6-liter 8-cylinder engine paired with a automatic 4-spd, sending power through front-wheel drive.

Engine, transmission, and drivetrain together drive most of the variation in fuel economy across trims. A larger engine moves the car with less effort but burns more fuel. A turbo lets a small engine punch above its weight, often without much MPG penalty. All-wheel drive adds traction and weight, and usually costs a couple of MPG compared with two-wheel drive of the same engine.

Vehicle class

Midsize Cars

Engine

4.6L 8-cylinder

Transmission

Automatic 4-spd

Drivetrain

Front-Wheel Drive

Fuel type

Regular

Annual petroleum use

15.7 barrels per year

Common questions about the 2003 Cadillac Seville

Quick answers to the questions people most often search for when looking up the 2003 Cadillac Seville.

• Is the 2003 Cadillac Seville fuel efficient?

  It is in line with the rest of the class. The 2003 Cadillac Seville returns 19 combined MPG, and the average car in the Midsize Cars class for the same model year sits at 19.8 MPG.
• What MPG does the 2003 Cadillac Seville get?

  The EPA rates the 2003 Cadillac Seville at 19 combined MPG, 16 MPG in city driving, and 25 MPG on the highway. Real-world numbers depend on your driving style, the weather, and how loaded the car is.
• How much does it cost to fuel a 2003 Cadillac Seville per year?

  The EPA estimates an annual fuel cost of $3,150 for the 2003 Cadillac Seville. That figure assumes 15,000 miles of driving per year, a 55% city and 45% highway split, and the EPA's published average fuel price for the rated fuel grade.
• What fuel does the 2003 Cadillac Seville use?

  The EPA lists the 2003 Cadillac Seville as running on regular gasoline. Using a different grade than the manufacturer specifies can affect fuel economy and engine longevity.
• Has the Cadillac Seville become more fuel efficient over time?

  Combined MPG has stayed close to flat across the run. Both the earliest (1984 Cadillac Seville, 21 MPG) and most recent (2004 Cadillac Seville, 19 MPG) versions sit in the same range.
• How much CO₂ does the 2003 Cadillac Seville emit?

  Tailpipe CO₂ emissions are 468 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 7,016 kilograms of CO₂.
• What is the difference between the city and highway MPG of the 2003 Cadillac Seville?

  City driving returns 16 MPG and highway driving returns 25 MPG, a gap of 9 MPG. A spread that wide is typical of cars with conventional automatic or manual transmissions, where stop-start city traffic eats more fuel than a steady highway cruise.
• What engine is in the 2003 Cadillac Seville?

  The 2003 Cadillac Seville has a 4.6-liter 8-cylinder engine.
• What transmission and drivetrain does the 2003 Cadillac Seville have?

  The 2003 Cadillac Seville comes with a automatic 4-spd transmission and front-wheel drive.
• How does the 2003 Cadillac Seville compare to the best car in its class?

  The most efficient car in the Midsize Cars class for the 2003 model year is the Honda Accord at 25 combined MPG. The Cadillac Seville returns 19 MPG, a gap of 6 MPG. If you are comparing on fuel economy alone, the class leader is worth a look.

Source: U.S. EPA fuel economy dataset. Annual fuel cost figures assume 15,000 miles of driving per year and a 55% city, 45% highway split. Real-world mileage varies with driving conditions, vehicle maintenance, fuel quality, and driver behaviour.