I got another 1-2 MPG using the spacer also. But had to remove it when I installed my GT intake & bored TB (won't fit) Not sure if it helped performance all that much.
Sounds like you have an auto tranny there & doing a bit of city driving.Higehest I got was 28 on a long distance highway trip. usually I get between 17-21 in the city depending if I keep my foot in it or not.[8)]
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04 GT 5 spd, S1, Mopar Sways, Eibach springs, Airbox mod, K&N drop-in filter, AGP & AMX hard pipes, debadged, PTeazer grill, bumperette, rollpan, Cowl Induction hood & other assorted painted parts!!!
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