I agree with dgc333. Something is way wrong. I've had my turbo for 13 months and the worst I have ever gotten was the week I installed the Stage 1 upgrade. That week I got 13.7 MPG, but it included a lot of playing (read: punching it) and 15 passes down the drag strip!
My daily commute is 26 miles stop and go city driving and I usually get about 245 miles per fill up, netting a little over 18 MPG. I have only been on a couple of longer highway type trips, but averaged about 23 MPG on those. As those who know me, I am not about mileage when I drive my cruiser. While I don't really speed excessively, I rarely baby it.
I would say it's time to take your cruiser to the dealer and have it checked.
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PT-Dave
2003 Cranberry Turbo GT
Stage I, custom 3\" exhaust & Cowl Intake, Mopar BOV, Dual gauge pod w/vac-boost & A/F meters, Hood Struts, Yokohama ES-100\'s
Best 1/4 so far: 14.489 @ 93.65, best 1/8: 9.222 @ 74.261
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