W/S, Cultus is not well known for its mileage on petrol, and surprisingly Civic might give equal, or even more mileage than Cultus on petrol (somewhere around 9-12 km/l in city i guess), but my sincere advice is, if you're thinking about switching from Cultus to Civic , you better make your heart as well as your pocket big enough for the change and don't bother on such minor issues and price comparisons coz Civic is Civic after all, no comparison of both the cars in any aspect !