Changes to the engine management software along with new low-rolling resistance tires have netted a 3-mpg increase in highway mileage for the 2007 Ford Focus 2.0-liter with a manual transmission.
The Focus now will deliver 27 mpg in the city and 37 mpg on the highway (31 mpg combined). The 2.0-liter automatic delivers 27 mpg in the city and 34 mpg on the highway (30 mpg combined). For 2007, the base Focus models come equipped with 14-inch Hankook tires that offer better rolling resistance than the 2006 model.
|Ford Focus Fuel Economy (2.0L)|
(EPA-rated mpg US)
|% Change in 2007 Man.||+4%||+9%||+7%|
|% Change in 2007 Auto.||+4%||+6%||+7%|
The 2006 Ford Focus with the 2.0-liter engine and a manual transmission was EPA-rated at 26 mpg city, 34 mpg highway and 29 mpg combined. The change in the 2007 model thus represents a 7% increase in combined cycle fuel efficiency.
The 2006 Focus with an automatic transmission had a rating of 26 mpg city, 32 mpg highway, 28 mpg combined. The corresponding 2007 model also provides a 7% boost in efficiency.
The Focus engine was originally calibrated for emissions. We noticed during testing that we could get a lot better fuel mileage by making some adjustments to the calibration while still meeting emissions.—Nicholas Schubeck, supervisor, Powertrain Calibration for Ford Motor Company
The engineering team increased the engine’s spark and revised the exhaust-gas recirculation and intake manifold runner control (IMRC) schedules. The IMRC is a device on the intake manifold that increases the velocity of the air going into the cylinder at low speeds. Increasing air velocity helps in the proper air-fuel ratios.
The issue is that the system also creates a lot of pumping losses, which reduce fuel mileage. By opening up the IMRC a lot earlier to reduce pumping losses, fuel mileage was increased.—Nicholas Schubeck
The extra engine spark also improves acceleration, and the refinements to the engine have eliminated the hesitation that normally occurs when the air conditioning is in operation, according to Ford.