ES1/8 cvt model is very efficient. I owned an ES8 for 2 years and it gave me above 15kmpl long run. Dont go for non evts, they are thirstier than cvt
check whether CVT oil change history, need to do it in every 15000km. cost would be about 7500-8000/=
Check CVT box before buying. If gear engagement is delayed in cold start, or floor it and check if it jerks too much. Minimal jerky acceleration should be acceptable