Not really, because though it clearly is an advantage, you can barely use it to charge more than the 60 kWh unless you try some (unpractical) trickery. How many people live on a hill? How many people live on a really high mountain? Our way goes downhill for about 1 km ~ 0.62 miles, but the recuperated energy is just between 200 and 270 Wh. That certainly has no influence on a decision to purchase the 75 kWh upgrade or not.