By this point, most - if not all - of us have seen the promotion from Chase for using the United Visa to pay our taxes and getting double the miles. The information on it is available here.

The terms tell us that for Federal tax payments there is a fee of 2.49% So, unless basic math escapes me, with double miles for each dollar that puts the "cost" of the miles at 1.245%. Is that a good "price" for miles? I have sufficient cash to pay my bill, but thought I should see if it was a good deal to use the card instead.

Anyone have an opinion?