On: Where are the Voyagers?

[civilian]

Nitpicky but.... we'd still want to use gravitational slingshots even if we had more deltaVs to burn.

[hcrisp → civilian]

Yes, in fact per Mark Adler [0] you'd use a Jupiter flyby to fly back to the sun and then do a high thrust burn at closest approach to maximize your speed into interstellar space (Oberth effect).

[0] https://www.quora.com/Can-we-use-the-gravity-of-the-sun-to-s...