Author Options:

Instant MPG gauge for OBDII Answered

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.

1 Replies

capt.tagon (author)2009-07-25


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

Select as Best AnswerUndo Best Answer