* Higher bond yields, dollar pressure futures
* Costco reports better-than-expected results
* Futures: S&P off 1.1 pts, Dow off 9 pts, Nasdaq up 4.25
NEW YORK, Dec 8 (Reuters) - U.S. stock index futures were mixed on Wednesday, pressured by rising bond yields and a stronger dollar.
* Yields rose along with the greenback following Tuesday's deal to extend tax cuts that intensified worries about inflation and the costs of the government's debt burden.
* Higher bond yields makes it more expensive for consumers and businesses to borrow, while stocks and the dollar have moved in opposite directions of late. A rise in yields and the dollar could also draw money away from equities.
* The 10-year U.S. Treasury yield rose to 3.25 percent overnight, a level not seen since late June and beyond Tuesday's high of 3.18 percent.
* Adding negative sentiment was news the U.S. Securities and Exchange Commission has issued more than a dozen subpoenas in its investigation of insider trading on Wall Street, potentially undermining public confidence in the markets.
* The S&P 500 faces resistance at the 1,228 level, which represents the 61.8 percent Fibonacci retracement of the 2007-2009 bear market slide, a key technical indicator. The level was confirmed as strong resistance on Tuesday after the index broke through during the session but closed below that point at 1,223.12.
* S&P 500 futures dipped 1.1 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 9 points, while Nasdaq 100 futures added 4.25 points.
* Bellwether Texas Instruments Inc said it was confident a recent correction in demand for its chips would be short-lived, and also narrowed its earnings outlook in line with estimates.
* Retailer Costco Wholesale Corp posted a better-than-expected quarterly profit as sales and traffic rose at its U.S. stores and the weakening dollar helped sales overseas.
* Fortune Brands Inc, which owns Jim Beam whiskey, Titleist golf balls and faucet maker Moen, plans to split into three companies.
* Stocks eked out a small gain Tuesday after an earlier advance as a tax cut deal was derailed by the rising bond yields and reports of the insider-trading probe.