Eerl
EERL was the one I was thinking of that has the mobile setup. IIRC the Prof. in charge says it's "Energy in equals .x energy out", which is a good rule of thumb, when you don't consider catalysts. He didn't return my call. The official lines of the EPA and FTC seem to be that gas additives do not improve mileage. That might be because the testing they require is so expensive - not less than $54K to put 2 cars through the FTP-75 tests, Stages 1 & 2 - last time I looked. That cuts out a lot of inventors.
You can closely simulate their testing (sans dyno) simply by using a mobile setup like EERL's. They are using the pistol-grip style probe up the tailpipe, hose run through the car window. The DashDyno will log up to 16 obd2 items, including external GPS (though I'm not sure it does elevation) and has been used by universities in studies. Presumably the gas analysers have a serial out for logging to a laptop or whatever.
Let us know about the opacity meter project progress!
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