My bike has a 500w motor. All out on level ground is about 27-28mph without pedaling (I run out of pedals around 24-25mph with my gearing).
Actual battery watts drawn is more like 700-750 at that speed, if that helps your calculations any. Let's say you need ~800w for 30mph cruise with pedaling and slight elevation changes. Your upgraded battery would be 1.85 kwh. That means you'd go 69 mi at 30mph. Your current setup is good for 50 mi at that speed.
The upgrade doesn't sound worth it unless you can't charge at that 35 mile destination.
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