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Currently I'm not using anything. I have an 89 Honda wagon. I used a vacum gauge for quite a while and I had a voltmeter hooked up to the oxygen sensor. It was instructive, up to a point, but it wasn't as helpful as I'd like.
I'd like to get a way to monitor instant mileage, average mileage and timing, but with what I am getting, I can't see enough of a potential savings to justify, plus I need to keep every nickel as I can.
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