What kind of mileage are you seeing so far? They do pretty good for how big they are.
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Originally Posted by Isaac Zackary
- If possible, in the future I'd like to install a heat tank system like on the Gen II Prii.
- A wild idea of mine would be to increase the battery capacity (like with a secondary lithium ion battery) and make it a plugin. There's a company named Enginer that makes kits for this, but they're not cheap by any means.
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Toyota ditched the heat tank with the Gen3 Prius and switched to having the exhaust heat up the coolant for faster warm up. Heat tank seems like a complicated solution that only helps in specific use cases. Your Avalon might have a system in place to decrease warm up time, but I haven't looked into them enough to know. If it doesn't, I would lean more towards something like the Gen3 Prius' system than the Gen2.
Does Enginer still actually make kits? Those kits were alright when they first came out, but they don't make sense with all the PHEVs available now.
Unless you have money to burn, I wouldn't mess with adding battery capacity. I think CNG would make more sense and pay off quicker than messing with the battery.