Sir Toyota Terios new one 7 seater 4WD manual has an average of 8km/l in city with 6 people and A/C, on highway its 12km in same condition @120km/hr.
No idea about Avenza but it should be same since they both share almost same specs.
The resale is not good or it is not measured yet.
Performance is satisfactory for Terious as long as on Petrol and not compared with a car (like Xli or City).
Quality and equipment well exceeds the price.
4WD Terios is a much sensible choice since it can do some off roading and is a 7 seater (not for long distances).