The diversion of oil from the Midwest will narrow the gap between the West Texas Intermediate Oil and the Brent Crude.

FORBES: Kinder Morgan Flexes Growth Muscles With Beefed Up Canadian Pipeline To Feed Asia

The price spread between Brent crude oil, the European benchmark and West Texas Intermediate crude oil, the U.S. benchmark, widened sharply because of the loss of Libyan crude oil production.

FORBES: 'QE3' Would Be The 'Most Bullish Factor' For Commodities -- Panel

The ETF purports to track the price of West Texas intermediate crude oil.

FORBES: How To Avoid ETF Pitfalls

The price signal at issue is the way that the WTI (West Texas Intermediate) oil price benchmark has diverged so greatly from the other three, Mars, LLS and Brent.

FORBES: Keystone XL Pipeline and Prices as Signals

As you can see in the chart below, over the past 5-, 15- and 30-year cycles, West Texas Intermediate crude oil prices head higher in March, and have generally continued to climb through September.

FORBES: The Case For Higher Crude Prices

Cushing is the price settlement point for West Texas Intermediate Sweet Crude Oil on the New York Mercantile Exchange (NYMEX).

FORBES: Saudi King Defies Iran's Mullahs To Help Obama

In November, a pipeline deal was announced between Enbridge and Enterprise Products Partners, causing West Texas Intermediate (WTI) oil prices to jump.

FORBES: Stars Align For Year-End Rally In Stocks

The most obvious is the price of the American oil benchmark, West Texas Intermediate (WTI).

ECONOMIST: The world economy��s improbable saviour

Bakken crude even trades at a discount to West Texas Intermediate (WTI), the benchmark oil for the US set by prices in Cushing, Oklahoma.

FORBES: Differential Equations: The Rangeland Energy deal and the big picture

Indeed, Brent has gained in dominance in recent years as investors have moved away from West Texas Intermediate, the U.S. crude oil benchmark.

WSJ: Brent Benchmark Is Skewed by Crude Measure