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I'd like to trade in my 2007 Mazda3 1.6 petrol and change to a diesel engine. Fuel economy and lower tax would be important as I cover around 360 miles a week mostly motorway driving. I'd like a roomier car in the back for two children and a bigger boot. Was thinking of a diesel car or SUV. What would my Mazda3 be worth on trade-in?
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