I've heard stories about the Matrix consumption. As the owner of one, it depends largely on how one drives. Mine returned an average of 12.73km/L. For a 1.6 manual, that's nothing to crow about; but there's nothing to be worried of either.
In terms of power and pickup, it can be a little sluggish, due to its heavy body. But since you're not an F1 or kamikaze driver, its performance is just adequate.
To all potential buyers, if interior space at the region of $65K is what you're looking for, then search no further... Matrix offers space in spades! Headroom, legroom and whatever rooms you'd need is in abundance. Mercedes A-class LWB may beat the Matrix in interior space, but you can't even get a second-hand A-class for this kind of money!
Refinement can be a little coarse, and a little rough on the edges. But for that sum of money in Singapore, where cheap cars is an oxymoron, you can't really ask for that much. It may be characterless on the road, but what it doesn't have; you'd probably don't need!
For a budget, fuss-free family transport, Matrix is highly recommended. I have no regrets in getting my Matrix, it's the best car I can give to my family!