The above figures are my personal experiences. Driven around 750km in 5500rs of petrol roughly equivalent to 50.4 liters of petrol with AC on and road conditions worst to good. Minimum avg is 10km/litre if going uphill on AC.
Regarding maintenance costs well let me put it here what I did to my city vario which I bought used with 122k on the odo.
I changed the whole of suspension minus shock absorbers as they are perfect for 30000rs brand new. An oil change with filter and air filter cost around 5000rs. Remember to check the engine mounts the sound is heard like tuk when u put car in D or in R. Another thing to consider is that vario should not in any way be driven with cng as it ruins cvt in few days. The thing to check is there shouldn't be any sound like trrrrr when u put lever to D or R from P or N. That means ur vario transmission is in need of service which costs alot. The cabin noise apart from tyres should be non when go on road. Check the cars automatic fan thingy it should be in perfect running condition in other worst thermostat valve. Idsi engine needs 8 sparks plugs but u don't need to check them if the cars engine is working flawlessly. That's it please ask any more questions if u need to.
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