A ten year old car with 100hp using 95 octanes could make on average about 8l/100km. Currently they're about 5l to 6l on average. On 1000km that's close to 30l,

A ten year old car with 100hp using 95 octanes could make on average about 8l/100km. Currently they're about 5l to 6l on average. On 1000km that's close to 30l, with a rate of 1.20€ per litter that's 36€. On a lifespan of 150k that's 5400€.