bmw’s 20s airplane engine
fuel economy 70 liter per 100 km (less than bugatti)
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Yeah, Brutus! 
It’s the creation from hell of the Technik Museum Sinsheim (Germany) around the BMW V12 engine that powered f.e. the famous Dornier Do J II Wal or the Heinkel He-111. The numbers:
Name: BMW Flugmotor VI
Production cycle: 1926 - 1937
Type: V12 60° | 2 Valves per cylinder | upright shaft | overhead camshaft
Displacement: 46.92 litres
Horsepower: continous 585 hp @1350 rpm | short high power 750 hp @1700 rpm
Torque: 2600 nm
Ignition: 2 sparkplugs per cylinder, Bosch double magneto
Experimentalfahrzeug Brutus | Technik Museum Sinsheim
Let’s not forget that Jeremy Clarkson also had the “pleasure” of driving it… 
Jeremy Clarkson vs 'The Brutus' Bomber BMW (TOP GEAR) - YouTube
And it’s not a good idea to run Brutus on a grass field - because flames…
Brutus and his BMW engine - YouTube
farm9.staticflickr.com/8141/7675248634_e67f0ef248_b.jpgExperimentalfahrzeug BRUTUS by Technik Museum Sinsheim und Speyer, auf Flickr
farm8.staticflickr.com/7123/7675245542_85dea653da_b.jpgExperimentalfahrzeug BRUTUS by Technik Museum Sinsheim und Speyer, auf Flickr
farm8.staticflickr.com/7119/7675247380_01539e0bc8_b.jpgExperimentalfahrzeug BRUTUS by Technik Museum Sinsheim und Speyer, auf Flickr
farm9.staticflickr.com/8282/7675246378_aa0349e381_b.jpgExperimentalfahrzeug BRUTUS by Technik Museum Sinsheim und Speyer, auf Flickr