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You don't get more power for nothing! Use it and you'll use more fuel - that's physics. Keep it down though and as E92fan says you can benefit from improved efficiency at lower revs.
But you can FORCE economy with clever mapping.....
My brother, via some US contacts, is working on industrial scale ECU mods for a couple of large UK delivery companies using transits / sprinters etc.
He is trialling / selling them remaps for fleets of vans, basically to stop nobhead drivers thrashing the arse of the motors. The fuel and servicing and insurance savings will run into millions of pounds per year by limiting speed & revs whilst still giving driveability at full load. They're running a 3 month trial on 50 vans now.
Large fleet operators buy vehicles en-masse without extended warranties ayway so they're only interested in savings on running costs.
Watch out for a delivery driver doing (exactly) 56mph near you soon!
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