No, a spoiler for a 2004 Dodge Intrepid will not drop the gas mileage.
A 1998 Dodge Intrepid has a 17 gallon gas tank capacity.
it is in the gas tank .
Dodge Intrepid was created in 1993.
It holds 18 gallons.
Find the leak, and fix the cause.
The main sources for an emissions leak on a 98-2002 dodge Intrepid are the fuel filler neck, gas hose in the engine, or gas tank