+8.7% on the Elantra. The real adjustment probably is around 5% but I like to know the number I see is a worst case scenario.
The TDI is just not accurate on the
scangauge. I just use it as a relative incidator to see how I'm doing between trips. It would need a different correction factor for each rpm. In fact, it the correction factor could be just a linear equation formula, it would be much more accurate.