Stay off the wine roads south of Dijon at this time of year - unless you're into wine of course. Just busy busy. I tend to take the 996 south from Dijon to Bourg en Bresse. From there I'd suggest the 1075 to Grenoble.
After Grenoble take either the 1091 and N94 via Briancon to Gap or the N85 Route Napoleon. The first one is a more scenic ride (if the weather's good) but the second one is quicker. Or stick with the 1075 as it heads south to Sisteron but it's a bit of a windy road at times.
Between Gap and Sisteron there's a choice of either sticking with the N85 or the 1085 which parallel each other down the river valley. After Sisteron take the D4 down as far as the Verdon river. After that a combination of the D554 to Brignoles, the D43 and the A57 for the last few miles into Toulon will get you to the port.
My suggestion for an overnight stop would be somewhere in Gap, a provencal town I really like. I'll be down that way myself in early Aug.
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