Cheapest Gas in Casper, WY

Updated May 21, 2026 — Prices updated regularly from EIA data

$3.00

Lowest price at Costco in Casper

Finding Cheap Gas in Casper

Gas price hunting in Casper, Wyoming rewards the prepared driver. The spread between today's lowest ($$3.00) and highest ($$3.25) local prices is $$0.25 per gallon — a meaningful difference for anyone filling up weekly.

Maximum Savings in Casper

Choose Costco over Chevron

$0.25 per gallon

$3.75 per 15-gallon fill • $12.00 per year (est.)

Cheapest Brands in Casper

Rank	Brand	Est. Price	Savings vs. Most Expensive
#1	Costco	$3.00	$0.25
#2	Speedway	$3.12	$0.13
#3	Circle K	$3.13	$0.12
#4	Sunoco	$3.16	$0.09
#5	Marathon	$3.17	$0.08
#6	BP	$3.19	$0.06
#7	Mobil	$3.20	$0.05
#8	Exxon	$3.21	$0.04
#9	Shell	$3.23	$0.02
#10	Chevron	$3.25	$0.00

Gas Saving Tips for Casper Drivers

Do not let your tank run below a quarter — low fuel levels increase wear on electric fuel pumps and can lead to emergency fill-ups at inconvenient and expensive stations.
Check fuel prices across state lines if you regularly travel near a border. State fuel taxes vary by up to 50 cents per gallon — the savings from crossing into a lower-tax state can be dramatic.
Use cruise control on highways to maintain steady speed. Speed variability increases fuel consumption; steady-state driving at 65 MPH uses significantly less fuel than oscillating between 55 and 75.
Avoid idling for more than 60 seconds. Modern engines warm up faster while driving than idling, and idling gets literally zero miles per gallon.
Park in shaded areas when possible — parking in the sun increases evaporative fuel loss from your tank and makes the engine work harder to cool the cabin when you start driving.