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Originally Posted by Thorium-Synfuel
The difference between the stock Fiat Panda and the "500L", which goes the other way in mass, is indicative of substantial fuel savings by trimming about 200 kg. From some 1250 kg in the 500L model to 1000 kg in the Fiat Panda. So with the Metro at the featherweight 750 kg. What do you think it could achieve on the highway?
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Besides weight reduction, aerodynamics also play a relevant role on that matter.
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I haven't come across any "0.9 twin air natural power" engines, here in Ireland. Don't know if it even sold.
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AFAIK in Ireland LPG is more usual as a motor fuel than CNG.