Combined CDF and D0 Upper Limits on Standard Model Higgs-Boson Production with up to 6.7 fb$^{-1}$ of Data

We combine results from CDF and D0 on direct searches for the standard model (SM) Higgs boson (H) in p{bar p} collisions at the Fermilab Tevatron at {radical}s = 1.96 TeV. Compared to the previous Tevatron Higgs search combination more data have been added, additional new channels have been incorporated, and some previously used channels have been reanalyzed to gain sensitivity. We use the latest parton distribution functions and gg {yields} H theoretical cross sections when comparing our limits to the SM predictions. With up to 5.9 fb{sup -1} of data analyzed at CDF, and up to 6.7 fb{sup -1} at D0, the 95% C.L. upper limits on Higgs boson production are factors of 1.56 and 0.68 the values of the SM cross section for a Higgs boson mass of m{sub H} = 115 GeV/c{sup 2} and 165 GeV/c{sup 2}. We exclude, at the 95% C.L., a new and larger region at high mass between 158 < m{sub H} < 175 GeV/c{sup 2}