Originally Posted by
percysmith
The loss can be quantified and I have already done so that.
Say you run 45 Amex transactions a month (I did in April 2011), your loss from rounding down is 45 x 2.5 (average of rounding down) x 1.6 (earn rate) = 180 miles a month.
If I spend $1,450 I already earn back the rounding down from Citi. Any spending after that is pure profit. YMMV on whether you run more or less than 45 Amex transactions a month or not.
If 1.6 mile/S$ only kicks in at S$2,000, then my breakeven point for using Altitude over Premiermiles is S$2,450. Not such a clear cut winner now.