The fuel consumption of 2WD non turbo model is about 32km per litre (according to their website but mostly 20km-25km per litre in real life , turbo and AWD model's fuel consumption is not better so you have to decide between fuel consumption or performance)
Service and maintenance cost is similar to wagon r and spacia
Interior space is less than the spacia but similar to the wagon r
https://www.suzuki.co.jp/car/sp/hustler/detail/ (you can compare hustler models in this website "remember to use Google translate to translate this page ")