Editing Wankel engine (section)

==Regulations and taxation==
National agencies that tax automobiles according to displacement and regulatory bodies in [[automobile racing]] use a variety of equivalency factors to compare Wankel engines to four-stroke piston engines. Greece, for example, taxed cars based on the [[#Chamber volume|working chamber volume (the face of one rotor)]], multiplied by the number of rotors, lowering the cost of ownership.{{citation needed|date=December 2022}} Japan did the same, but applied an equivalency factor of 1.5, making Mazda's 13B engine fit just under the 2-liter tax limit. FIA used an equivalency factor of 1.8 but later increased it to 2.0, using the [[#Displacment|displacement formula described by Bensinger]]. However, the DMSB applies an equivalency factor of 1.5 in motorsport.<ref>TECHNISCHE DMSB-BESTIMMUNGEN 2023 [https://www.dmsb.de/de/automobilsport/bergrennen/file/280400], 1 January 2023</ref>