WTI (West Texas Intermediate) and Brent are the two primary global crude oil benchmarks. They usually track each other within 1-3 dollars per barrel, but the spread can widen sharply due to transportation bottlenecks, regional supply shocks, or political events.
From 2011-2014, the WTI-Brent spread exceeded 20 dollars per barrel at times due to US shale production outpacing pipeline capacity from Cushing, Oklahoma. Post-2015, export pipeline buildouts narrowed the spread back to typical single-digit levels.
For US consumers: Brent is actually a better predictor of your gas price than WTI, since much US gasoline is produced from imported Brent-linked crude. When you see Brent rising, expect gas prices to follow within 2-4 weeks.