2010 Ford Taurus, 3.5L DOHC NA V6, 103K miles, zero mods. So I've notice this engine is hard on gas, way harder than the 3.4L I had in the Grand Am. Yesterday I drove a total of 8 miles around the city (no hard accelerations or long time idling) and according to my fuel computer thing, I went from 354 miles until E to 335 miles until E in only 8 miles of driving. That's a usage of 19 miles of gas in 8 miles. This seems very high too me. What do you guys think? I run Lucas every fill up and when I first purchased the vehicle I ran some GumOut.