If the fuel pack on a newly purchased vehicle actually did provide that much evergy over an extended period of time, we would likely see the marketing of the concept of the "disposable vehicle."
40,000 kilometers is about 25,000 miles. That isn't a lot of driving for many people but OTOH people like me that only drive five to six thousand miles per year could be a customer for such a vehicle. Drive it for four or five years, then trade it for a new model.
Your used vehicle then either gets refurbished, re-fueled and sold as a rebuilt car or it is scrapped and recycled for materials to make new vehicles.
Rather than a disposable vehicle, I think it will be like a core charge for a battery. You turn in the old one and buy a new one, and the store recharges/refurbishes or disposes of the old LENR heat pump. It’s like getting 25k miles on a tank of gas. Refilling stations will be fewer and farther between.
What I see is the creation o a standard power pak ~ you guy it seperately from everything else and have it installed. otherwise it looks like the same old automobile.