(Dow Jones) -- Dairy giant Dean Foods (DF), facing a shrinking population of milk drinkers and other volume pressures, has focused attention on streamlining. It's reduced miles driven and fuel gallons consumed by its milk trucks by 7% this year, based on rerouted trips from processing plants to grocery stores. CFO Chris Bellairs says the effort has been "equal to or greater than" the impact from volume declines. He adds the supply-chain restructuring is still in the "early innings." Despite 2Q revenue and EPS meeting expectations, shares are down 6.9% at $17.52 to erase much of the year's gain.