I am using a Micro - D20 Sedan , and most of the points you mentioned in the above are correct. Considering the price factor , the Car could consider as a good option.
Fuel consumption is around 8 -10 within city limits , which was bit common in used Toyota 1.5 vehicle. For long distance , as you mentioned it is around 16-17 .
Could not predict the future. Already drove over 2000 KM , so far so good.
( Need to accept that , expecting the Toyota quality in a Chinese car is useless. But 2000% better than Indian products or peredua )