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I'd change the tyres - here in Europe they are all sold with ratings A-E ratings for noise and fuel economy etc. Apparently a few extra MPGs can be squeezed out that way.
Better quality fuel (if available) is also meant to help.
Decent oil change also helps.
At the end of the day you'd probably get the best results from fitting a more modern engine but you have to look at the bigger picture => how much money will you spend to pay less at the pumps...
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