what's with him saying it cant really handle freeway driving very well?

I have a 1978 300CD with a ton of miles and it will still easily handle freeway speeds as long as you arent pushing it past 75 or so. It will do its claimed 93 mph top speed, but this tends to bring the temp up after a few minutes.
Anyway, yeah it was cool to see my exact year and model of car profiled on the video, just wish they'd have found a cleaner example and didnt talk so deprecatingly about its lack of power.
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2007 Dodge Ram 3500 Cummins Turbo Diesel 4x4
1994 GMC S-15 pickup 4.3 5MT
1985 300 SD
1978 300 CD
1962 220-S Fintail - awaiting restoration