Φυσικό αέριο κίνησης ή πετρέλαιο; Ποιο συμφέρει;

Volkswagen Golf 1.4 TGI 110 hp VS Golf 1.6 TDI 110 hp BlueMotion
Fiat Panda 0.9 TwinAir 80hp CNG VS Panda 1.3 95hp diesel
Fiat 500L 0.9 TwinAir 80hp CNG VS 500L 1.3 95hp diesel
Fiat Punto 1.4 70hp CNG VS Punto 1.3 75hp diesel
Fiat Doblo 1.4 T-Jet 120hp CNG VS Doblo 1.6 120hp diesel
Fiat Qubo 1.4 70hp CNG VS Qubo 1.3 75hp diesel
Mercedes B 200 c 156 PS VS B 200 d 136 PS
Mercedes Ε 200 156 PS CNG VS E 220 170 PS diesel
SEAT Leon 1.4 TGI 110 PS VS Leon 1.6 TDI 110 PS diesel
VW Passat 1.4 TSI 150 PS CNG VS Passat 1.6 105 PS diesel
Audi A3 1.4 TFSI g-tron 110 hp VS A3 1.6 TDI 110 hp
Skoda Octavia 1.4 TGI G-TEC 110 hp VS Octavia 1.6 TDI 110 hp