Tax cuts and GDP Growth

The Council on Foreign Relations has an informative graph (see here) showing the impact of various factors on GDP growth in the U.S.

In the Council's post, there is the following:

U.S. annualized real GDP growth of 1.2% through Q3 2011 was driven by personal consumption, accounting for 91% of it.  Yet only 44% of personal consumption growth was driven by higher incomes.  The other 56% was accounted for by unsustainable items: a decline in savings (36%) and the payroll tax cut (20%).  The latter will expire in two months time unless Congress acts to extend it again.