A few auto companies are switching to turbo charged 4 cylinder engines to replace a naturally aspirated V6's. Hyundai is a great example. In the new Santa Fe SUV and mid sized sonata, engine choices include a naturally aspirated 2.4 liter 4 cylinder at around 200hp or a 260-260hp turbocharged 4-cyclinder. My question is about fuel economy. How come highway fuel economy figures are -worse- for the turbocharged engines. Common sense tells me that the smaller engine (displacement) would be more or at least equivalently efficient when producing the same horsepower to keep the vehicle moving at a specific highway speed. The turbo charger should have little effect, with good engine design, at low engine loads it shouldn't reduce overall fuel efficiency.
- posted
12 years ago