@jaribu did you ever get your B15?

I am a happy owner of a 2001 FB15. Consumption is very good. No major or significant breakdown other than changing parts which get worn out with time.

If still buying do't go for the 1300cc B15 but go for the 1500cc FB15.
The load is the same so the extra 200cc will be good to pull that weight giving you less fuel consumption.

As @dexco wrote, service at the right time, don't buy cheap oils and cheap parts.