I can't comment on your car specifically, but both my Echo and my Civic will easily account for that kind of mileage drop using a/c.
The water injection idea is awesome though! That's something I'd always be too lazy to try but it hits my sensibilities just right.
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'97 Honda Civic DX Coupe 5MT - dead 2/23
'00 Echo - dead 2/17
'14 Chrysler Town + Country - My DD, for now
'67 Mustang Convertible - gone 1/17
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