I try to avoid buying gas in Howard County in general because of the price - but Centerpark Exxon is relatively clean, hardly even a line and the prices are a few cents cheaper (usually) than most of EC and Columbia. The only thing that sucks is the exit puts you out into the top of a three way intersection (basically forming a four way intersection) - so its really hard to know if the person opposite of you is going to let you go or not. Should they? They have a stop sign, you don't... but you're also not technically on a road (leaving a parking lot)...
Oh well.
Oh - they take Plenti Rewards too.. which unfortunately award by galon not by dollar value - but still.
They also have a car wash and discounts on gas if you use it - I haven't yet. read more