Buying a new car and considering fuel economy? It’s crucial to understand how the Environmental Protection Agency (EPA) changed its testing methods for 2008 vehicles, including cars, trucks, and SUVs. These changes significantly impact how fuel efficiency is reported.
Before 2008, EPA testing, often conducted with manufacturer input, used dynamometers in controlled environments. While these simulated driving conditions, they didn’t fully replicate real-world factors like wind resistance or accessory usage (air conditioning, etc.). This created a standardized comparison but often overstated actual fuel economy. Furthermore, pre-2008 tests used slower simulated speeds – only 48 mph for highway and 20 mph for city tests – far below average driving speeds.
In 2008, the EPA implemented a more rigorous testing system. This new system accounts for faster acceleration, higher speeds, colder temperatures, and the use of accessories during testing. Consequently, while providing a more realistic estimate of fuel economy, the new method generally resulted in lower mileage projections.
This change occurred alongside increased fuel efficiency in 2008 models due to rising gas prices. However, the new testing system might misleadingly suggest that newer vehicles are less fuel-efficient than older ones on paper. Comparing an older model to a 2008 vehicle without understanding the updated EPA standards could lead to the incorrect conclusion that keeping the older car is the better option. In reality, even non-hybrid models are becoming increasingly fuel-efficient.
For example, the 2008 Isuzu Ascender had advertised fuel economy of 14 mpg city and 20 mpg highway. While these numbers might seem low initially, they’re comparable to other midsize SUVs in its class, such as the Ford Explorer, Mercury Mountaineer, GMC Envoy, and Chevy Trailblazer. The Jeep Grand Cherokee and Hummer H3 received slightly lower ratings under the new testing system.
Despite appearing less fuel-efficient than previous years, the 2008 Ascender’s 4.2-liter, six-cylinder engine was recalibrated for improved efficiency. Consumer Guide reported an acceleration of 0 to 60 mph in 8.8 seconds.
The key takeaway? Comparing fuel economy between pre-2008 and 2008+ models is misleading. Instead, focus on comparing the newest models to accurately assess fuel efficiency and make informed purchasing decisions.