Oil prices lost ground on Thursday, easing from their highest levels in more than a month as OPEC+ producers stuck to a plan to boost production and U.S. fuel stockpiles surged amid declining demand. The global benchmark Brent crude futures fell 87 cents, or 1.08%, to $79.93 a barrel, as of 0154 GMT. U.S. West Texas Intermediate (WTI) crude futures lost 62 cents, or 0.8%, to $77.23 a barrel.