very hard to turbocharged a prius with oto cycle engine. You wlll blow the whole transaxle up. Even a mercs mechanic with 30 yrs experience dont dare to mod my prius. However , you can turbocharged it , but you will need hell lots of money. The ECU TCU cannot handle boost.

Since you are so interested in mod the Prius c, have you done the sound insulation? The car rather noisy; road noise, tires noise...etc.

set your aircond to 26 degree above, avoid battery level below 50% at all time.

You have very good record, congrats. Mind tell what is the actual cents/km when you pump the petrol over the mileage done? I found that when using diff petrol, the display show different but actual mileage is the same. Some petrol the display show >26km/l and some show 17km/l but actual mileage are the same which is about 10~12cents/km.
thanks.

This is what I worry. I used to pump Shell petrol the meter shows 16~17km/l which actual fc is 11cents/km for distance driving. This time, I pumped Caltex petrol, immediately the meter show 24~25km/l. I am not sure what cause the meter to read differently. Surprisingly the reading is immediately after I left the petrol station.