Earlier I mentioned about using the right spark plugs for the K3-VET. I was using the spark plugs with the wrong gap and averaging 11.5km/l (bad). Its been 2 weeks since I changed to the correct spark plugs and my fuel consumption are as below:
All RON95 petrol
346.4km @ 27.105 litres, 12.77km/l
360.3km @ 28.211 litres, 12.77km/l
311.5km @ 24.050 litres, 12.95km/l
385.6km @ 28.580 litres, 13.49km/l
I can safely conclude that using the correct IK22 spark plugs in the K3-VET engine has improved my fuel consumption consistently. I thought my old spark plugs were IK20, but they were actually the similarly specification NGK Iridium BKR6EIX-11 with 1.1mm gap for the Myvi K3-VE.
Used NGK Iridium BKR6EIX-11 for sale at a bargain. Only RM50 with free Poslaju nationwide. Perfect for your Myvi 1.3L K3-VE 05 to 07.
I see a lot of people recommending IK20 for K3-VET, which is the wrong plugs. You can listen to them or you can listen to Denso Japan.