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My SPF has the older style convertible top (vinyl 2 bow), which I use (when needed) spring/summer/early fall. I install my hardtop for late fall/winter driving.
I don't like to run higher than 55mph with the convertible top on, unless I have the side curtains installed. With the top up and no side curtains installed (at speed), you get a lot of air pressure inside which puts strain on the windshield. My side curtains have velcro that attaches to the inside of the convertible top, making for a pretty good seal along the top edge of the side curtains.
The newer canvas 3 bow tops have a rear window which can be opened with a zipper, allowing air to exit the cabin throught the back. I am sure that this would alleviate the problem on the earlier cars.
I know that a lot of owners have upgraded their earlier cars to the newer style convertible top. When my top begins to wear, I will upgrade also.
Bottom line.... I won't drive 65-70 with my (early) soft top unless the side curtains are on. If the weather is going to be bad and I will be doing a lot of driving, I just install the hardtop. Not 100% dry, but almost!!!
Maybe someone with the newer style top can jump in with their experiences...
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