Settlement Discount VS Investing to determine which is more beneficial

A supplier is offering an early settlement discount if invoice is settled a minimum of 8 days prior to the end of the month based on an int rate of 8% . if one invested the funds one would earn 6.5% Should one settle early or investment and settle the last day of the month

Say the payment amount was 1,000,000, then the settlement would be (1,000,000*8%)/365*8 = 1,753.42

When Investment the funds do I compute (1,000,000 x 6.5%) /365*8 so as to determine whether one should settle early or forgo the settlement discount and rather keep the funds invested and settle the last wotking day of the month ?