I did a rough calculation and I got average 13km/l on my current usage. I've seen certain 1.5 manual myvi users posting their average of 16km/l all the way up to 21.7km/l. So if i'm really light footed I can achieve similar average?
21.7km/L is hybrid territory. Impossible to achieve on real roads in a Myvi.
16-17km/L is possible with a Myvi 1.5 manual as a friend of mine regularly achieves that and he's not exactly slow either. The trick is not light feet, it's smooth driving with minimal variances in your gas pedal.
My Sylphy if I were to rev 3k RPM and maintain the 150km/h speed all the way to JB from KL, I'd get a pretty good FC of 14km/L which isn't much but for a large saloon with a 2.0L engine it's not bad. However in city since it's most of the time stop-go traffic and inconsistent throttle best I get is 10km/L and worst 8km/L. If I maintain 110km/h from KL to JB I'd die of boredom first then get an incredible 16km/L in the Sylphy. My auto Myvi's concept is similar. City driving usually 12-14km/L. Highway about 15-16km/L easily.
Oh I think it's been shared before but if you want to save more fuel, strip the car down to be as light as possible. Drive smoothly and maintain a throttle point where it's not too high and not too low, usually below 3k RPM. The boring range.