Lancer has got limited market, so It would be difficult to find one in good shape and it'd take some time to sell it again. But it's a nice car if you intend to keep it for a while.
And as far as mileage of civic is concerned, i guess it'd be 8-9 kmpl city and 12-13 highway.
If you want better mileage, citi vario and belta would be better option. Belta would also have better safety features, but i don't understand why safety is low on your priority list