Gas Prices Along Interstate 8

Updated April 5, 2026 — Prices updated regularly from EIA data

Route • 2 states

About Interstate 8

Running 349 miles from San Diego, CA to Casa Grande, AZ, I-8 crosses the Sonoran Desert. Gas prices at California stations near the western terminus are among California's highest, while Arizona stations offer significant relief.

Avg. Price Along Route
$3.77
Est. Trip Fuel Cost
$151
Price Range
$3.03–$4.51

Gas Prices at Each Stop

Fueling Tips for Interstate 8

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Frequently Asked Questions

For a trip along Interstate 8, a vehicle averaging 25 MPG would use approximately 1 gallon per 25 miles. At current average prices along the route, budget approximately {perMileCost} cents per mile for fuel. Plan fill-ups in lower-price states whenever possible.
Yes — consistently. Highway-exit gas stations charge 10-25 cents more per gallon than stations just 1-2 miles off the interstate. Whenever possible, exit the highway and drive to a commercial area for competitively priced fuel.
Gas prices along Interstate 8 vary significantly by state due to different fuel tax rates. States like Texas (20 cents/gallon), Missouri (17 cents), and Oklahoma (20 cents) consistently offer the most affordable fuel. Pennsylvania (59 cents) and California (67 cents) are among the most expensive.
Fill your tank before entering high-price states along your Interstate 8 route. Use the GasBuddy app to see upcoming prices and plan fill-up stops at the cheapest available locations. Always fill up when you have a quarter tank remaining — running low limits your options.
Interstate 8 passes through several states on its route. Oil-producing states like Texas, Oklahoma, Louisiana, North Dakota, and Wyoming typically offer the cheapest gas along any interstate that traverses them.

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