> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nozlerouting.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Vehicle: MPG, tank size, and YMM lookup

> The Vehicle object — direct specs like MPG and tank capacity, or year/make/model lookup — used by the Nozle optimizer to compute fueling plans.

A fuel-efficiency profile. Either direct specs
(`mpg`, `tank_capacity_gallons`, `current_fuel_gallons`) or a
year/make/model lookup. Direct specs always win when complete;
lookup is a convenience for partners who don't track tank size.