Missouri's diesel tax of 29.5¢ per gallon is below the national average. Truckers running I-70 east should fill up completely in Missouri before crossing into Illinois (73.8¢) — saving $66 per 150-gallon fill.
Missouri's 2Q 2026 Special Diesel rate is 29.5 cents per gallon, below the national average. For interstate carriers, Missouri's position at the crossroads of I-70 and I-44 makes it a valuable fueling state — especially for east-west runs heading into Illinois (73.8¢).
The math is hard to argue with: fueling your 150-gallon tank in St. Louis instead of Illinois saves $66 in IFTA tax liability (150 × $0.443 difference). Truckers running Chicago-to-Kansas City or Chicago-to-Dallas via I-44 should plan a full fill-up on the Missouri side every time. The difference compounds significantly across a fleet.
I-70 (East-West Spine): Kansas City east through Columbia, St. Louis to Illinois border. One of the busiest cross-country freight corridors in the US — tank up in St. Louis before entering IL.
I-44 (Southwest Corridor): Oklahoma/Texas border northwest through Joplin, Springfield, St. Louis. Major freight route connecting the Southwest to the Midwest.
I-55 (North-South): Illinois border south through St. Louis toward Memphis. Critical connector between Chicago and Southeast freight markets.
I-29 (North-South, Western MO): Kansas City north toward Iowa border. Agricultural and livestock freight corridor.
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