@Mulezen I have about 350 miles on the new Allant now and may be changing my mind about adding the range boost to it. What I am finding is that the new gen 4 Bosch speed motor is quite thirsty for electrons at speed. I am getting around 40 miles before the remaining battery drops below 20% with the bike set on Tour with an average speed around 15 mph and 32 miles on Sport assist mode with average speed around 185mph. This is roughly equivalent, if not a few miles less than I get on a 75 lb. Riese & Muller Homage full suspension bike with Rohloff hub and gen 2 HS Bosch motor and a 500 watt hour power pack (it jumps up to 80+ pounds when I mount the second battery to it.
Given that the Allant has a 625 watt hour battery and weighs 51 pounds, the extra electron consumption is clearly being used for the enhanced torque made available in the gen 4 motor. As far as I can tell that extra torque makes itself particularly useful once one gets into higher speeds. It is much easier to sustain 22-25 mph speeds with the gen 4 motor and I do like riding fast and far on a regular basis, something that will require another battery, if I am going to use this bike for longer rides. I generally do at least one and often two rides per week that range between 40 and 60 miles. The Allant in any assist mode is a much quicker bike, quicker off the line, quicker to accelerate in the mid range and easier to sustain speeds in the mid 20s but all that comes at the cost of range, even on a bike that weigh 25 lbs. less.
In the interest of fairness and full disclosure. I was diagnosed with a malignant soft tissue sarcoma in my left quad back mid February and started chemotherapy just when the Allant arrived. Though I have been cycling regularly through this my energy level is down and I am riding with a bit less power than I normally do. The good news is that the tumor is shrinking and I have lost a few pounds that I put on through the winter and could still afford to drop a few more...oh and my prognosis is hopeful.
While I do have two batteries on the Homage that can accomplish the range I need, I am now on the fence about adding the range boost to the Allant. This is a byproduct of how much plain fun it is to ride this bike and I just want to be able to go further on it. Besides Trek can install the range boost hardware without the battery for around $300. I have plenty of Bosch Power Pack 500s I can borrow from other bikes.
I found a photo of the bike with the range boost hardware on it but no battery mounted. Too bad it is not designed to be easily removable and only there when you need it. While it does take away significantly from the stealthiness of the Allant, it is something I might be able to get used to. Opinions?