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The 17" alloys can affect mpg, if you have the incorrect tyre size you could increase the engine rpm for any given speed / gear.
What was the standard tyre size and what are you running now?
If the standard was 195/65 R15 then you need 205/50 R17 or 195/50 R17 to keep the gearing the same.
this is good to compare http://www.miata.net/garage/tirecalc.html
Currently in mlythaby's garage:
2005 Scenic 1.9DCi 120