Yes, you really need to test with a Mity-Vac. Be aware that even the lowly 240D manual HVAC setup has vacuum controls. So if you turned the air conditioner on or off during that 5 mile drive, it could have an effect. The HVAC vacuum is supplied by the green line with yellow stripe.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References