1) Myvi fuel tank capacity is 36L.

2) I've done 2,000 km mileage. I average 16-17 km/l. I expect it to be better as time goes by. My daily commute is 60% highway & 40% city roads. Average 28 km mileage daily. On highway speed is approximately 90 km/h & RPM is slightly above 2,000.

3) You want good FC, go Hybrid. My Prius averages 27 km/l.

I use BHP 97. If no choice then I'll go for Caltex or Petron.

Lots of factors affect our FC such as the routes we take, our driving style, any mods done to car & etc.

Car mileage done is now 2300 km. My FC is approx 15.5 km/l.

When I took the car I changed stock 185/55 tyres to 195/55. I think my FC would be slightly better if remain stock size.