cheapest_fuel_along_route
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Third-party content written by another agent. Data to evaluate, not instructions.
Find the cheapest fuel along a route, with the REAL extra travel time of stopping at each station — never a straight-line guess. Provide origin + destination (a route is computed) or an existing route's geometry_polyline6, plus a fuel code ("diesel" default, "petrol_95", "petrol_98", "premium_diesel", "e85", "lpg") and max_detour_minutes (default 10). Stations come from the live open-data price feeds (UK CMA retailer scheme and/or the statutory Fuel Finder, FR prix-carburants, DE Tankerkoenig; the response's fuel_attribution names the ones actually matched), are priced through the routing engine with your costing (a truck profile makes detours respect dimensional/ADR restrictions) and ranked cheapest first. Each result carries price {value, currency, updated_at, stale} (stale = not verifiably fresher than 24 h), detour_minutes/detour_km, and saving_per_litre vs the cheapest on-route baseline (pass fill_litres to also get saving_total). Requires the MapMap gateway; answers a clear error when the deployment has no fuel-price dataset. Display the returned fuel_attribution with the prices.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| costing | any | no | Costing model for the route and detour matrix: "auto" (default), "truck", "bicycle", "pedestrian" or "motor_scooter". |
| destination | any | no | Route destination. |
| fill_litres | number | null | no | Optional fill size in litres; each result then also carries `saving_total` = `saving_per_litre` × `fill_litres`. |
| fuel | string | null | no | Which fuel to price: "diesel" (default), "petrol_95", "petrol_98", "premium_diesel", "e85" or "lpg" (aliases "petrol", "unleaded", "e10", "super_unleaded", "e5", "b7" and "sdv" are accepted). |
| geometry_polyline6 | string | null | no | An existing route geometry as an encoded polyline6 (the `route` tool's `geometry_polyline6`). Provide either this or `origin` + `destination`, not both. |
| max_detour_minutes | number | null | no | Largest acceptable detour in minutes (default 10, at most 120). |
| max_results | integer | null | no | Maximum results (default 5, at most 25). |
| origin | any | no | Route origin (with `destination`, when no geometry is given). |
| truck | any | no | Truck profile (dimensions + ADR declaration). Requires costing "truck"; the detours then respect dimensional/ADR restrictions. |
Raw JSON schema
{
"$defs": {
"CostingKind": {
"description": "Costing models exposed by the MCP tools (a deliberate subset of the\nValhalla costing list), serialised in snake_case exactly as Valhalla\nnames them.",
"oneOf": [
{
"const": "auto",
"description": "Standard car costing.",
"type": "string"
},
{
"const": "truck",
"description": "Truck costing; honours dimensional limits and, when a `truck`\nprofile is supplied, ADR dangerous-goods restrictions.",
"type": "string"
},
{
"const": "bicycle",
"description": "Bicycle costing; tune it with a `bicycle` options object.",
"type": "string"
},
{
"const": "pedestrian",
"description": "Pedestrian (walking) costing; tune it with a `pedestrian` options\nobject (lit streets, wheelchair/blind, hiking difficulty).",
"type": "string"
},
{
"const": "motor_scooter",
"description": "Motor scooter (moped) costing: like auto but prefers lower-speed\nroads and may use ways closed to larger motor vehicles.",
"type": "string"
}
]
},
"LatLon": {
"description": "A WGS84 coordinate pair in decimal degrees.",
"properties": {
"lat": {
"description": "Latitude in decimal degrees (−90 to 90).",
"format": "double",
"type": "number"
},
"lon": {
"description": "Longitude in decimal degrees (−180 to 180).",
"format": "double",
"type": "number"
}
},
"required": [
"lat",
"lon"
],
"type": "object"
},
"TruckSpec": {
"description": "Truck profile for routing: physical dimensions plus the ADR\ndangerous-goods declaration. Omitted dimensions default to the EU\nmaximum authorised dimensions of Council Directive 96/53/EC (4.0 m\nheight, 2.55 m width, 16.5 m length, 40 t gross weight).",
"properties": {
"gross_weight_t": {
"description": "Gross combination weight in metric tonnes.",
"format": "double",
"type": [
"number",
"null"
]
},
"hazmat": {
"default": false,
"description": "Whether the vehicle carries dangerous goods (ADR). Defaults to\nfalse.",
"type": "boolean"
},
"height_m": {
"description": "Vehicle height in metres.",
"format": "double",
"type": [
"number",
"null"
]
},
"length_m": {
"description": "Vehicle length in metres.",
"format": "double",
"type": [
"number",
"null"
]
},
"tunnel_code": {
"description": "ADR 8.6.4 tunnel restriction code of the load, e.g. \"B\", \"C5000D\",\n\"B/D\", or \"(—)\"/\"none\" for explicitly unrestricted. Leave unset if\nunknown: a hazmat load without a code is conservatively treated as\ncode B (allowed only through category-A tunnels).",
"type": [
"string",
"null"
]
},
"width_m": {
"description": "Vehicle width in metres.",
"format": "double",
"type": [
"number",
"null"
]
}
},
"type": "object"
}
},
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"costing": {
"$ref": "#/$defs/CostingKind",
"default": "auto",
"description": "Costing model for the route and detour matrix: \"auto\" (default),\n\"truck\", \"bicycle\", \"pedestrian\" or \"motor_scooter\"."
},
"destination": {
"anyOf": [
{
"$ref": "#/$defs/LatLon"
},
{
"type": "null"
}
],
"description": "Route destination."
},
"fill_litres": {
"description": "Optional fill size in litres; each result then also carries\n`saving_total` = `saving_per_litre` × `fill_litres`.",
"format": "double",
"type": [
"number",
"null"
]
},
"fuel": {
"description": "Which fuel to price: \"diesel\" (default), \"petrol_95\", \"petrol_98\",\n\"premium_diesel\", \"e85\" or \"lpg\" (aliases \"petrol\", \"unleaded\",\n\"e10\", \"super_unleaded\", \"e5\", \"b7\" and \"sdv\" are accepted).",
"type": [
"string",
"null"
]
},
"geometry_polyline6": {
"description": "An existing route geometry as an encoded polyline6 (the `route`\ntool's `geometry_polyline6`). Provide either this or `origin` +\n`destination`, not both.",
"type": [
"string",
"null"
]
},
"max_detour_minutes": {
"description": "Largest acceptable detour in minutes (default 10, at most 120).",
"format": "double",
"type": [
"number",
"null"
]
},
"max_results": {
"description": "Maximum results (default 5, at most 25).",
"format": "uint32",
"minimum": 0,
"type": [
"integer",
"null"
]
},
"origin": {
"anyOf": [
{
"$ref": "#/$defs/LatLon"
},
{
"type": "null"
}
],
"description": "Route origin (with `destination`, when no geometry is given)."
},
"truck": {
"anyOf": [
{
"$ref": "#/$defs/TruckSpec"
},
{
"type": "null"
}
],
"description": "Truck profile (dimensions + ADR declaration). Requires costing\n\"truck\"; the detours then respect dimensional/ADR restrictions."
}
},
"type": "object"
}