Quote:
Originally Posted by JohnnyGrey
Forget the scangauge. It lacks the accuracy and the resolution to tell you anything meaningful. |
That's not my experience using one in controlled conditions. The last series of back-to-back runs I did
testing vortex generators had a standard deviation of .6%. I'd call that decent resolution. It's less important that the absolute MPG readings are 100% accurate, as long as the relative differences are consistent.
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However, I would say that tank-to-tank "testing" of acetone is a waste of time. Too many variables involved to draw a conclusion. Despite the ambition, and the title of this thread, you're not going to "get to the bottom of this" on the road.
EDIT: the "idle" method you describe with a graduated cylinder would be more reliable. Don't forget you need to account for fuel return as well (if your van has a fuel return line).