Doesn’t this say enough to allow the whole pipeline to be built.
Check it out:

A new study claims that a just-built 485-mile stretch of the Keystone XL pipeline has been a huge economic boon for two dozen rural and poor Oklahoma and Texas counties—and will create the same significant impact in five other states if the project’s long stalled northern segment ever wins White House approval.

As the debate rages over the future of the $5 billion mega-project, a team of university researchers has released a report showing the economic benefits of Keystone’s Gulf Coast Pipeline, which just opened in January after 17 months of construction, linking Cushing, Okla., and Nederland, Tex. The study by the Maguire Energy Institute at Southern Methodist University says the pipeline has pumped $3.6 billion into the Texas economy and $2.1 billion into the Oklahoma economy, while creating thousands of jobs directly and indirectly. It has also boosted tax revenues by millions of dollars, according to the study.