In combined cycle (city and motorway), the Ford Focus 2008 Wagon 1.8 16V fuel consumption is 7 litres per 100km (14.3 km/l), fuel consumption in city - 9.5 l/100km, highway fuel economy - 5.6 l/100km. For a car with a 30mpg average text book, I dont think 28mpg average is poor at all this time of year. Engines love cold air. More cold air means more fuel used. Summer makes cars more economical. Mine pulls like a train this time of year and the mpg falls from 45mpg running around to about 42mpg.
For older cars especially, it’s important that fuel filters get changed approximately every two years or every 30,000 miles. If you suspect a dirty fuel filter to be the cause of your decreased gas mileage, bring your car into your local Firestone Complete Auto Care for a fuel pressure test. 5. Worn Out Piston Rings.
Ford Focus – (tomas devera photo / Shutterstock) 1. Low tire pressure. Underinflated tires can have a significant impact on the fuel economy of your Ford Focus. When tire pressure is lower than the recommended level, the tires can deform more, leading to increased rolling resistance.

Years produced: 2008, 2009, 2010. Ford Focus ST specs (2008-2010), performance, dimensions & technical specifications - encyCARpedia   Car Specs  Rankings  Garages

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ford focus 2008 fuel consumption