Calculate if driving to a cheaper gas station saves money after factoring in extra distance. Find your fuel price break-even point.
Is it worth driving across town for cheaper gas? This calculator answers that question by comparing the fuel savings from a lower price against the extra fuel cost of driving the additional distance to reach that station.
Often, a gas station a few miles away offers fuel that's $0.10–$0.20 cheaper per gallon. But the extra round-trip miles consume fuel too. For small fill-ups or small price differences, the detour can actually cost more than it saves.
This break-even calculator factors in your tank fill amount, the price difference per gallon, the extra distance to the cheaper station, and your vehicle's MPG to determine whether the trip is worthwhile.
Whether you drive a compact sedan, a full-size SUV, or a pickup truck, accurate gas price break-even figures help you plan smarter and avoid costly surprises at the pump or dealership. Use this tool regularly to track changes over time and adjust your transportation budget accordingly.
Many drivers waste time and fuel chasing marginally cheaper gas. This calculator tells you definitively whether the detour pays off, helping you make rational fueling decisions instead of guessing. Results update instantly as you adjust inputs, making it easy to explore different scenarios and find the best option for your driving needs and budget.
Savings = Gallons × (Nearby Price − Cheap Price) Extra Cost = (Extra Miles ÷ MPG) × Cheap Price Net Savings = Savings − Extra Cost
Result: Net savings: $2.07
Savings on 14 gallons = 14 × $0.20 = $2.80. Extra fuel cost = (6 ÷ 28) × $3.39 = $0.73. Net savings = $2.80 − $0.73 = $2.07. Worth the trip.
The key insight is that cheap gas only saves money on the gallons you buy, but the detour costs fuel on every extra mile. If you buy 10 gallons and save $0.10/gallon, that's $1.00 saved. But driving 5 extra miles at 25 MPG costs about $0.70 in fuel, netting only $0.30.
Small price differences (<$0.05/gallon) with moderate detours (>3 miles) rarely save money. Similarly, if you're only buying a few gallons (topping off), the absolute savings are too small to justify any extra driving.
Fill up at warehouse clubs on regular shopping trips (zero extra miles). Use GasBuddy to find cheap stations on your existing routes. Fill up in low-tax states during road trips. Avoid highway exit gas stations, which typically charge $0.20–$0.50 more.
Gas prices often follow weekly patterns, with Tuesday/Wednesday being cheapest. Prices rise before holidays and weekends. Filling up midweek can save $0.05–$0.15/gallon without any detour.
As a rule of thumb, it's worth it when the price difference times your gallons exceeds double the detour fuel cost. For most scenarios, a $0.15+ difference on a full tank with less than 5 miles extra driving is worthwhile.
Costco gas is typically $0.20–$0.40 cheaper per gallon. At $0.30 savings on 50 gallons/month, that's $15/month or $180/year. A basic Costco membership costs $65/year, so gas savings alone can cover it if you fill up there regularly.
No, this calculates fuel cost savings only. If you value your time at $20/hour and the detour adds 15 minutes, that's $5 in time cost. Add that to the fuel cost of the detour for a complete picture.
Use whichever grade you normally buy. The price difference between stations is usually similar across grades ($0.10–$0.20), so the break-even math is about the same regardless of octane.
All gas in the US meets EPA standards regardless of brand. Top Tier stations add extra detergents, but the base fuel is virtually identical. Buying from a high-volume station (fast turnover) is more important than brand.
Some programs offer $0.05–$0.10/gallon in rewards. Factor this into the effective price. A station at $3.55 with $0.10 rewards is effectively $3.45/gallon, which may beat a cheaper station with no rewards.