how to improve gas milage on 3.7L jeep liberty engine?

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Answered: Dual exhaust help gas milage

In general, adding dual exhaust alone will not help. It will reduce backpressure on the engine, but unless you get the air/fuel mixture re-adjusted, it won't help much. If you get the fuel/air mixture optimized after the modification, you could gain a couple miles per gallon and some performance.

Answered: How can you get better gas mileage for a 1998 chevy s-10 ext cab? right

If you're city driving in stop and go traffic, don't expect much more. If you're driving on the open road, I would make sure the timing is correct, the plugs are good, the fuel system is clean, etc.

Answered: Is there research that supports Techron increasing gas mileage?

In a practical sense, relative to using truly competitive products, probably not. Compared to some crap no one would use anyway, it probably would appear to help.
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