25th August 2009, 09:55 AM
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Wizard
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Join Date: Jan 1970
Location: Mt Lawley, Perth
Posts: 1,613
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If you drop the speed 5km/h to 100 I believe your economy will improve disproportionately. When I did my last big trip in the 300tdi at 90kmh, I had to stop every now and then to let fuel out! 
Also I have heard that aircon can improve economy on modern cars because the windows are all closed and thus aerodynamics is improved. I can't see this being an issue with Defenders though
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James Hamilton
'96 Defender tdi 110 Wagon.
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