The drive from Pecos, TX to Killeen, TX covers 391.4 miles and takes about 7h 8m behind the wheel.
This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on US 87, I 20, East State Highway 158 for much of the mileage,
and the overall profile is highway-focused drive.
The longest uninterrupted segment is about 104.4 miles on US 87.
At current regular gas prices, budget about $59.79 one way before food or hotel costs.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
195.7 miles from Pecos, TX
A natural place for your longest stop of the day
, about 3h 27m into the drive
.