Which cars have the best fuel economy at highway speeds 100km/h (62 mph), I'm aware some hybrids and diesel hatches have highway figures arould 3.5lt/100km but some actual results would be appreciated too. I'm interested more in non hybrid cars. On a side note best economy at high speeds (>130 kmp/h) would be interesting too. I did some driving in italy recently (Hyundai I40 diesel) entirely highway travel, returning approx 6.1 lit/100km/h averaging 140km/h. Does anyone have any comparison for this?