Note that it doesn't work out to an even number anyway because you do not receive miles on taxes from MCI, but you should receive miles on the entire bill from MCI (including taxes) from AMEX, so overall your earnings will be a little less than that.

For example, say your bill is $100 + $10 in taxes.

From MCI: $100 x 5 = 500 miles
From AMEX DL: $110 x 2 = 220 miles
From AMEX DL (for "double miles"): $110 x 1 = 110 miles

Total earnings on a $110 MCI bill ($100 in MCI charges + $10 in tax) = 830 miles, or 7.545455 miles/dollar spent.

[This message has been edited by Beckles (edited 05-20-99).]