San Antonio, TX to St. Louis, MO Moving Truck Gas Cost

Fuel cost by truck size

Based on 903 miles, a gas price of $3.925 and a diesel price of $6.127 a gallon. Towing a car on a trailer or dolly lowers fuel economy by about 15%.

Truck	MPG	Gallons	Fuel cost	Towing a car
Cargo van	16	56	$222	$261
10 to 12 ft truck	11	82	$322	$379
15 to 17 ft truck	9	100	$394	$463
20 to 22 ft truck	8	113	$443	$521
26 ft truck	7	129	$506	$596
26 ft truck (diesel)	8	113	$692	$814

The gap between the smallest and largest trucks on this route is about $285 in fuel alone, so it pays to rent only as much truck as you need.

Fuel prices at each end of the move

Where	Gas	Diesel	Price basis
San Antonio, TX	$3.704	$5.903	Texas average
St. Louis, MO	$4.145	$6.352	Midwest average

Gas runs about $0.44 a gallon cheaper around San Antonio, TX. Fill the tank before you leave San Antonio and stretch it as far as you safely can.

Weekly retail averages from the U.S. Energy Information Administration for the week of October 19, 2026. Prices along the way will vary. EIA source

Planning the drive

A loaded box truck is slower than a car on hills and safest at moderate speeds, and most drivers find 450 miles a comfortable day. That makes San Antonio, TX to St. Louis, MO a 3-day drive, so budget for hotel nights and meals on top of fuel. The rental itself and any per-mile fees are charged separately from fuel.

Other moves

Going the other way? See St. Louis, MO to San Antonio, TX.

Moving truck gas cost from San Antonio, TX to St. Louis, MO