when i went from an ecotec powered cavalier to a 4.0l ford ranger i was in a bit of shock. i have since bought this thing : »
www.scangauge.com/ and have it set for average and real time fuel econ. it has helped me change my pedal habits quite a bit. When i first got the truck i was doing 16l/100km highway now im down to averaging 12l/100km