# Fuel Efficiency Converter API

> For the complete documentation index, see [llms.txt](/llms.txt).

Convert MPG, L/100km, km/L, and miles/L fuel-efficiency values.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `fuel-efficiency-converter-mpg-l-100km-km-l`
- Category: `conversion`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/fuel-efficiency-converter-mpg-l-100km-km-l/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/fuel-efficiency-converter-mpg-l-100km-km-l/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `value` | `float` | no |  |
| `from_unit` | `str` | no | mpg_us | mpg_uk | l_100km | km_l | mi_l Choices: mpg_us, mpg_uk, l_100km, km_l, mi_l |
| `tank_size_l` | `float | None` | no |  |
| `fuel_price_per_l` | `float | None` | no |  |
| `precision` | `int` | no |  |

## Example request

```json
{
  "value": 30,
  "from_unit": "mpg_us",
  "tank_size_l": 50,
  "fuel_price_per_l": 1.5,
  "precision": 4
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/fuel-efficiency-converter-mpg-l-100km-km-l/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"value":30,"from_unit":"mpg_us","tank_size_l":50,"fuel_price_per_l":1.5,"precision":4}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "fuel-efficiency-converter-mpg-l-100km-km-l",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the Fuel Efficiency Converter API do?

Convert MPG, L/100km, km/L, and miles/L fuel-efficiency values. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: (none). Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.