900 Rs is the maximum...So 20 units per 1 full charge?
1 unit costs LKR 45 (http://www.ceb.lk/for-your-residence-2/).
20 units = 900 LKR = 1 Full charge.
You can buy 7.692 L petrol for 900 LKR. If your fuel economy is 12 kmpl, that can take you 84 kms. AFAIK, a leaf can take you 160km per charge, making the Leaf slightly upwords of 2 times cheaper than the former.
If you have a Prius with 38 kmpl, that gives you 292 km.
So for the same price:
Vios/Yaris/Belta, etc: 84km.
Alto: 138km (18 kmpl)
Leaf: 160km.
Prius: 292km.
But people who has industrial type power supply only cost 440 rs For 20units
And some hotel can have one unit for 8 rs



