if you talk about leg room, the new Alto has surprisingly more leg room than cultus wagon r , even honda city : )
but yes overall, luggage space and width is a bit compromised..
however, if the engine is kept with care and is in good health, 1 lac kilometer does not matter for fuel avg. these engines can last very long if taken care of...
you have to get the car inspected properly mechanically and engine health wise. if it is okay, 75 to 1 lac km mileage does not matter much.
but there's another thing.. mostly used wagonr and cultus are already used as uber careem .. so they have mostly been juiced out already or meter reversed .. got to be careful with that ..
in best case scenario, if the car is driven between 60 to 80 km/h max speed and with very light foot...
a Honda city in city drive can give you 13.5 to 14.5 km/l mileage,
a cultus in city drive can give you 17 to 18 km/l mileage,
and on motorway, at 100 speed, a city can give you up to 20 km/l avg. and cultus maybe 22 km/l