100mpg in a Prius is basically unattainable. You'll see that only in a first gen Insight (easily), maybe a CRX or Metro that's really, really hypermiled.
A first gen Civic Hybrid (even with hybrid system removed or disabled) will likely use a little less fuel than a 2nd gen Prius, and a hybrid battery is essential for a Prius and not for the Honda, but Prii have some pretty amazing capacity in their hatches. Toyota's hybrids may absolutely require their hybrid systems functional, but their batteries are both cheaper and more reliable/longer lasting than Honda's, often coming in at less than $1,000 for a completely new one and less than $60 per cell of it's only a single cell that needs replacement.
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