Df137 Renault Clio 1.5 Dci: [verified]
Because the DF137 emits just (for the Euro 4 version), many examples fall into very cheap UK road tax bands (typically Band C or D, costing £20-£35 per year). In many European countries, this engine qualifies for "green" diesel status.
55–65 mpg (UK) / 4.5–5.0 L/100 km. Drive gently, and 70+ mpg is possible. df137 renault clio 1.5 dci