Route Detour Fuel Cost Calculator
Route detour fuel cost calculator compares direct and alternate route expenses side by side. See exactly how much extra fuel a longer detour costs and decide whether the reroute is worth it.
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Formula
Calculates fuel cost for both routes and shows the difference to help you decide if the detour is worth it.
Worked Example
How Route Detour Fuel Cost Is Calculated
- A 30% detour on a 200 km trip adds 60 km, costing roughly $10.20 extra at 10 km/L and $1.70/L
- Detours typically increase fuel cost by 10-30% depending on how far off course you travel
- Fleet operators multiply the per-trip penalty by daily trips to see annual impact
- Airlines rerouting around conflict zones face similar percentage-based fuel penalties
- Even a 15% detour on a daily 100 km commute adds over $900/year in fuel at $1.70/L and 10 km/L
Knowing the exact cost of a detour helps you weigh time savings against fuel expense and choose the most economical route for every journey.
You can also calculate changes using our Trip Fuel Cost Calculator or Fuel Cost Increase Calculator.
Frequently Asked Questions
When would I use this calculator?
When road closures, traffic, construction, or sanctions force you onto a longer route. This tool shows the exact fuel cost penalty so you can decide if the detour is worthwhile.
Does it apply to airlines and shipping?
Yes. Airlines rerouting around conflict zones and shipping fleets avoiding restricted waters can use this logic with their fuel consumption rates to estimate extra costs per trip.
Can I compare multiple detour options?
Run the calculator multiple times with different detour distances. For example, compare a 240 km detour vs a 280 km detour against a 200 km direct route to find the cheapest alternative.
How much does a typical detour add to fuel cost?
A 30% longer route adds about 30% more fuel cost. On a 200 km trip at 10 km/L and $1.70/L, that is roughly $10.20 extra. For a 50% longer route, expect about $17 extra.
How do I calculate detour cost for a fleet?
Multiply the per-trip extra cost by the number of vehicles and trips per day. A fleet of 20 trucks each paying $10 extra per detour on 5 trips daily adds $1,000/day or $365,000/year.
Does the detour affect vehicle wear beyond fuel?
Yes. Extra kilometres increase tire wear, oil change frequency, and maintenance costs. As a rule of thumb, add $0.05-$0.10 per extra km for total vehicle operating cost.
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