4.56 to 4.10

I went the other way 4.10, 4.30, 4.56 28" tire 200rpm change at cruise with the GVOD. A tenth quicker each gear. 6800 at the stripe in the hot summer air 340/A999 3500 tight TA 10" S-800. I expect to run 7K in good air. I do not use the OD at the track.