Oil markets dipped on Friday, pulled down by high fuel inventories and improving industry efficiency, but were still on track for a solid weekly gain.
Brent crude futures, the international benchmark for oil prices, were down 7 cents, or 0.1 percent, at $48.35 per barrel at 0443 GMT, but up 3.5 percent for the week.
U.S. West Texas Intermediate (WTI) crude futures were at $45.97 per barrel, down 11 cents, or 0.2 percent, but up around 4 percent over the week.
