![A compressed air engine for compressed air car "AirPod" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP A compressed air engine for compressed air car "AirPod" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP](https://c8.alamy.com/comp/2NF665N/a-compressed-air-engine-for-compressed-air-car-airpod-of-mdi-motor-development-international-is-seen-at-the-mdi-head-offiice-in-carros-near-nice-southern-france-friday-jan-30-2009-ap-photolionel-cironneau-2NF665N.jpg)
A compressed air engine for compressed air car "AirPod" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP
![A car powered by compressed air, the "Miniflow Air" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP A car powered by compressed air, the "Miniflow Air" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP](https://c8.alamy.com/comp/2NF665R/a-car-powered-by-compressed-air-the-miniflow-air-of-mdi-motor-development-international-is-seen-at-the-mdi-head-offiice-in-carros-near-nice-southern-france-friday-jan-30-2009-ap-photolionel-cironneau-2NF665R.jpg)
A car powered by compressed air, the "Miniflow Air" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP
![A car powered by compressed air, the "Miniflow Air" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP A car powered by compressed air, the "Miniflow Air" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP](https://c8.alamy.com/comp/2NF6683/a-car-powered-by-compressed-air-the-miniflow-air-of-mdi-motor-development-international-is-seen-at-the-mdi-head-offiice-in-carros-near-nice-southern-france-friday-jan-30-2009-ap-photolionel-cironneau-2NF6683.jpg)
A car powered by compressed air, the "Miniflow Air" of MDI (Motor Development International), is seen at the MDI head offiice in Carros, near Nice, southern France, Friday, Jan. 30, 2009. (AP
KLM Testing MDI AirPod Compressed Air Cars at Schiphol; UC Berkeley Study Finds Compressed Air Cars Significantly Less Efficient than Battery Electric Vehicles - Green Car Congress
![MDI engine scheme, 1 -piston with smaller diameter, 2 -crankshaft, 3... | Download Scientific Diagram MDI engine scheme, 1 -piston with smaller diameter, 2 -crankshaft, 3... | Download Scientific Diagram](https://www.researchgate.net/publication/356655034/figure/fig2/AS:1097791493419008@1638745296220/MDI-engine-scheme-1-piston-with-smaller-diameter-2-crankshaft-3-connecting-rod-4.jpg)