1600 CC - Altis Manual - 14-19Kms/pr. ltr on highway, 9-12kms/pr.ltr in city depending upon RPM control, driving manners.
1300 cc - Honda City -15-20kms/pr.ltr highway.
800CC - I suppose the answer must be Cuore. Definitely not the Chevy, it's a petrol licker, takes in more than the Altis.
Regards.