If you're into fuel economy, go for the 2.5d4d. City driving does not go below 9km/li; my average city driving is 10km/li; imagine the mileage for highway drives.

I used to own a 1.6VVTi altis where I averaged 10-11km/li in city driving; 2.7VVTi is almost double of the altis, hence, even if the VVTi engine is fuel efficient, expect an increase in gas budget. With this simple arithmetic, I opted for the 2.5d4d.

My actual experience: 1.6VVTi altis fuel consumption is equivalent to my 2.5d4d's.

Engine power is much, much more than the ordinary AUVs (crosswind, etc.)