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Old 01-16-2016, 07:25 AM   #4 (permalink)
EcoModding Lurker
Join Date: Dec 2015
Location: stevenage
Posts: 15

Gazers Car - '09 Nissan Pixo N-TEC
90 day: 44.34 mpg (US)
Thanks: 6
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Originally Posted by oldtamiyaphile View Post
But once you calibrate it to your car and driving, I see no reason why it shouldn't be accurate. After all, the AFR on a petrol engine running LPG still remains more or less constant.
Indeed you are correct. I use a Scangauge, on fill-ups. Just adjust what the computer thinks the volume of gas was to what it actually was using the + and - settings.
There are, if you want a very high degree of accuracy, some problems. My car switches over to LPG after about 1 mile. The Scangauge cant separate the difference between the fuels so the net result is a slightly miss-leading higher LPG MPG. This adds up to about one gallon of petrol consumed for every 6 weeks, and I can live this this.
Whilst setting the computer, don't forget to adjust it to true speed, which on my car was about 1.5% out, as this is effecting the overall mileage trip.
Lastly, the tank fill-up seems to vary from the estimated LPG remaining- I put this down to the cut-off valve is operating in slightly different positions. One fill gives good MPG, next time poor, but overall the tank fills will average out. This is one reason why I started the trip log on this site.
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