CHICAGO--(BUSINESS WIRE)--Fitch Ratings has lowered its corporate forecast assumptions for long-term WTI and Henry Hub natural gas to $70/bbl, and $3.75/mcf respectively as a result of increasing efficiencies and price pressure related to the U.S. shale boom. However, the long-term price for Brent remains unchanged at $80/bbl bringing the long-term spread between Brent and WTI up to $10. A drop in median full cycle costs supports the lower long-term WTI price. Lower completion costs, longer lat