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I can relate...
I have a 93 Chevy Lumina 4DR Sedan, I can get nearly 30mpg with all highway miles... ...put me in stop and go traffic and I'll get less than 20mpg, somtimes 15mpg.
So, changing from all highway to all city can lessen your mileage per tank as much as you've seen it. (Especially with a turbo-diesel)
-SF
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