Stock index futures declined further on Tuesday after U.S. data showed consumer spending and incomes were unexpectedly flat in June and personal saving rose to the highest level in a year.

Futures had already been pressured, easing back after Wall Street closed at its highest level in 10 weeks as disappointing results from Dow Chemical and Procter & Gamble pushed investors to the sidelines.

S&P 500 futures slipped 2.8 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures fell 37 points, and Nasdaq 100 futures were up 0.5 points.

(Reporting by Leah Schnurr)