Here's my advice if you go with a HCH 1 (mine currently has 219,000 miles on it and my lifetime average is around 60mpg).
All models except those sold in California have lean burn. Easiest way I know to tell the difference: there should be a sticker on the driver side rear door window. If it says "ULEV" it is lean burn. If it says "SULEV" it is not.
Get a manual. The CVT in the HCH1 is very very bad and expensive to repair.
You want either an '03 or an '04. With these two model years it is easy to wire an on/off switch to the clutch interlock switch which allows you to accelerate without using the electric motor (good for saving the battery and/or if you have a bad battery). For whatever reason this doesn't work on the '05.
I would also warn you that the hybrid battery will go bad (if you happen to find one that isn't already. They are pretty old at this point) so be prepared to refurbish/replace or do what I've done for the last few years, use it only for autostop and accelerate using only the ICE.
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