Within reason, the effect of weight is relatively insignificant at constant motorway speeds. Aerodynamic drag is what the car is working against most at 70mph.
Hybrids in relatively small aerodynamic cars like the Corolla, Prius, Ioniq etc are still very efficient (60+ mpg) at legal motorway speeds. Despite doing most of my miles in the motorway, my long term average (over more than 5000 miles) in the Swace only dropped marginally below 60mpg at the end of the winter and has risen above 61 again now. Although they don't make a non hybrid version, I reckon it would probably still do 55mpg just with the petrol engine.
In SUVs and crossovers, the hybrid fuel efficiency may look good on paper (and is at low speeds where the engine is off much of the time), but less good on the motorway in practice. Ultimately in that case you're still pushing a much taller and wider, less aerodynamic, lump of metal through the air with a petrol engine and there's no way of defeating the laws of physics.
So, in the OPs case, I'd say there's no compelling case to choose a self charging hybrid, but if the right car is hybrid and you're not paying a premium for it, it wouldn't matter if it was a hybrid.
I'd suggest plug- in hybrids would be less useful as they almost always carry a significant price premium over the non hybrid version. Also, for mild hybrids, make sure you have a decent test drive in them as the few I've had recently as hire cars (particularly the Fiat 500) have been rather wierd to drive, and very difficult to drive smoothly with no noticeable fuel economy benefit over similar cars.
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