There was a guy on youtube who had instructional videos about using veggie in his Jetta (think Colonial name for a Bora) 1.9 and had done so for about 50K miles - he was interviewed on some kind of TV program too. I'll do a search and post back if I find it. His Jetta/Bora was the same platform as yours.
The on board display is usually wildly out - you may find the instant display has a few "favourite" readings you always seem to hit.
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[I]So long and thanks for all the fish.[/I]
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