2008 Mercedes-Benz E320 Bluetec: MPG and fuel economy
The 2008 Mercedes-Benz E320 Bluetec is rated by the U.S. Environmental Protection Agency at 26 combined MPG, with 23 MPG in the city and 32 MPG on the highway. That puts it well above the average for cars in the Midsize Cars class in the same model year.
This page collects every fuel-economy figure the EPA publishes for the 2008 Mercedes-Benz E320 Bluetec. 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.
Key takeaways
- Returns 24% better combined MPG than the average car in the Midsize Cars class for the 2008 model year (20.9 MPG class average).
- The most efficient car in the Midsize Cars class for the 2008 model year is the Toyota Prius at 46 MPG.
- EPA estimates this car costs around $4,750 more in fuel over five years than an average new vehicle of the same model year.
Fuel economy at a glance
These are the EPA's official ratings for the 2008 Mercedes-Benz E320 Bluetec. 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).
| Combined MPG | 26 MPG |
| City MPG | 23 MPG |
| Highway MPG | 32 MPG |
| Annual fuel cost | $3,100 |
| Tailpipe CO₂ | 392 g/mi |
| Fuel type | Diesel |
How the 2008 Mercedes-Benz E320 Bluetec compares
The 2008 Mercedes-Benz E320 Bluetec returns 26 combined MPG. Cars in the Midsize Cars class for the same model year average 20.9 MPG, which puts this car ahead of the class average by about 24%.
The most efficient car in the Midsize Cars class for the 2008 model year is the Toyota Prius at 46 MPG. The bar chart below puts the Mercedes-Benz E320 Bluetec alongside the class best and the class average so you can see the full picture.
For broader context, the average new car of the 2008 model year (across all classes) returns 19.1 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 2008 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 diesel, which is $5.40/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 576.9 gallons (the car's annual consumption at the rated MPG).
| Driving pattern | Estimated annual fuel cost |
|---|---|
| Light driver, 7,500 miles per year | $1,550 |
| Average driver, 15,000 miles per year | $3,100 |
| Heavy driver, 25,000 miles per year | $5,167 |
Year-over-year MPG for the Mercedes-Benz E320 Bluetec
The EPA has rated the Mercedes-Benz E320 Bluetec across 3 model years, from 2007 Mercedes-Benz E320 Bluetec through 2009 Mercedes-Benz E320 Bluetec. 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 26 MPG.
| Year | Combined MPG | Open year page |
|---|---|---|
| 2009 | 26 MPG | 2009 Mercedes-Benz E320 Bluetec |
| 2008 | 26 MPG | this page |
| 2007 | 26 MPG | 2007 Mercedes-Benz E320 Bluetec |
Compare against other Midsize Cars for 2008
If you are cross-shopping the 2008 Mercedes-Benz E320 Bluetec, 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 Toyota Prius leads this group at 46 MPG, 20 MPG ahead of the 2008 Mercedes-Benz E320 Bluetec.
Specifications
The 2008 Mercedes-Benz E320 Bluetec runs a 3-liter 6-cylinder turbocharged engine paired with a automatic 7-spd, sending power through rear-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
- 3L 6-cylinder turbocharged
- Transmission
- Automatic 7-spd
- Drivetrain
- Rear-Wheel Drive
- Fuel type
- Diesel
- Annual petroleum use
- 13.7 barrels per year
Common questions about the 2008 Mercedes-Benz E320 Bluetec
Quick answers to the questions people most often search for when looking up the 2008 Mercedes-Benz E320 Bluetec.
-
Is the 2008 Mercedes-Benz E320 Bluetec fuel efficient?
Yes. The 2008 Mercedes-Benz E320 Bluetec returns 26 combined MPG, which beats the average car in the Midsize Cars class for the same model year by about 24%. -
What MPG does the 2008 Mercedes-Benz E320 Bluetec get?
The EPA rates the 2008 Mercedes-Benz E320 Bluetec at 26 combined MPG, 23 MPG in city driving, and 32 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 2008 Mercedes-Benz E320 Bluetec per year?
The EPA estimates an annual fuel cost of $3,100 for the 2008 Mercedes-Benz E320 Bluetec. 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 2008 Mercedes-Benz E320 Bluetec use?
The EPA lists the 2008 Mercedes-Benz E320 Bluetec as running on diesel. Using a different grade than the manufacturer specifies can affect fuel economy and engine longevity. -
Has the Mercedes-Benz E320 Bluetec become more fuel efficient over time?
Combined MPG has stayed close to flat across the run. Both the earliest (2007 Mercedes-Benz E320 Bluetec, 26 MPG) and most recent (2009 Mercedes-Benz E320 Bluetec, 26 MPG) versions sit in the same range. -
How much CO₂ does the 2008 Mercedes-Benz E320 Bluetec emit?
Tailpipe CO₂ emissions are 392 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 5,873 kilograms of CO₂. -
What is the difference between the city and highway MPG of the 2008 Mercedes-Benz E320 Bluetec?
City driving returns 23 MPG and highway driving returns 32 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 2008 Mercedes-Benz E320 Bluetec?
The 2008 Mercedes-Benz E320 Bluetec has a 3-liter 6-cylinder turbocharged engine. -
What transmission and drivetrain does the 2008 Mercedes-Benz E320 Bluetec have?
The 2008 Mercedes-Benz E320 Bluetec comes with a automatic 7-spd transmission and rear-wheel drive. -
How does the 2008 Mercedes-Benz E320 Bluetec compare to the best car in its class?
The most efficient car in the Midsize Cars class for the 2008 model year is the Toyota Prius at 46 combined MPG. The Mercedes-Benz E320 Bluetec returns 26 MPG, a gap of 20 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.