I have no idea what the fuel economy on a large gasser is. My 2008 2500HD GMC Sierra Duramax diesel on short trips from home to town around 5 miles uses 16Litres per 100KM's which translates to 14.7 mi/gal(US).
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Gord & Deb
2008 GMC SIERRA 2500HD DURAMAX
2015 Keystone Bullet 210RUDWE
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