Instant MPG gauge for OBDII

This is very simple. I want to know how to make a simple (& cheap) instant MPG meter for a vehicle fitted with OBDII (i.e. most recent vehicles) that will plug into the OBDII port.

capt.tagon8 years ago

Work in progress, you have four different protocols, determine which your car uses, interface for that then you extract information to calculate MPG.