diy mpg gauge

[itjstagame]

Actually I guess the only other signal that would be nice to have is TPS. Then you can compare throttle position to pulse widths and various loads.

I don't think I like MPG as an indicator, I'd like to see acceleration or maybe energy produced per gallon. I often wonder is accelerating slowly at 12MPG is better than accelerating quickly at 8MPG, etc. Finding the most efficient spot for acceleration coupled with EO P&G should help a lot. I would assume this would be maximum torque rpm, but I wonder how much of an effect throttle position has, especially with today's ecus, even at the max tq rpm, if you're cruising or WOT it's very different, typically different target AFRs and advances. Even building my own ECU I'm not sure 'theoretically' which would be better, lean is for efficiency but more power seems more efficient (unless it's less power/Gal).

Maybe the cruising/leaning is simply to try to help the fact engines aren't as efficient maintaining a steady state load versus accelerating against a load? That's why stuff like dropping out cylinders helps?

Sorry I keep posting, I'm just anxious to get playing with my vehicle and can't at the moment.