Hello, I commute 5x a week a distance of 32 km (per day 64 km x 5 = 320 km a week). I drive almost exclusively on the highway (the route is the Uni Bochum to Fernuni Hagen). Auto is an Opel corsa with 60 hp, which still has an old circuit where you have to manually insert the gears by means of a coupling. I pay about 40 euros per week for petrol (once a week the tank is empty and I have to fill up). This seems to me to be quite a lot and I I thought about driving more fuel-saving. Actually, I never drive faster than about 140 km/h. Do you think it makes a difference if, for example, I only ride up the tracks at 90-100 km/h and drive up to a maximum of 130 km/h? Thanks for the lift.