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A block heater would definitely help.
Increasing cat heat retention (insulation) would help.
Grille block would help.
Warmer intake air temp would help.
All potential uses of normally wasted heat energy would mean higher cat temperatures and better function.
It would be quite an accomplishment for Sentra to be able to maintain his fuel mileage,
AND
Satisfy his desire to not be a contributor to increased pollution.
It also means that the most dedicated hypermilers may be driving in ways that cause increased emissions. If that is resolvable then you have super high mileage and significantly lower total emissions than any normal driver., both in percentage and total volume. A smaller footprint it total, and certainly deserving of a dedicated effort.
It certainly is a goal worth pursuing and an admirable sense of ecological responsibility.
A tip of the hat to a man who is dedicated to both goals.
reagrds
Mech
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