An odometer or odograph is an instrument that indicates distance traveled by a vehicle, such as a bicycle or automobile. The device may be electronic, mechanical, or a combination of the two. The word derives from the Greek words hodós ("path" or "gateway") and métron ("measure"). In countries where Imperial units or US customary units are used, it is sometimes called a mileometer or milometer, or, colloquially, a tripometer.

₪== History ==

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Possibly the first evidence for the use of an odometer can be found in the works of Pliny (NH 6. 61-62) and Strabo (11.8.9). Both authors list the distances of routes traveled by Alexander the Great (r. 336-323 BC) as measured by his bematists Diognetus and Baeton. However, the high precision of the bematists's measurements rather indicates the use of a mechanical device. For example, the section between the cities Hecatompylos and Alexandria Areion, which later became a part of the silk road, was given by Alexander's bematists as 529 English miles long, that is with a deviation of 0.4% from the actual distance (531 English miles). From the nine surviving bematists' measurements in Pliny's Naturalis Historia eight show a deviation of less than 5% from the actual distance, three of them being within 1%. Since these minor discrepancies can be adequately explained by slight changes in the tracks of roads during the last 2300 years, the overall accuracy of the measurements implies that the bematists already must have used a sophisticated device for measuring distances, although there is no direct mentioning of such a device.

Leonardo di ser Piero da Vinci (Italian pronunciation: [leoˈnardo da ˈvintʃi]  pronunciation (help·info); April 15, 1452 – May 2, 1519, Old Style) was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist, and writer whose genius, perhaps more than that of any other figure, epitomized the Renaissance humanist ideal. Leonardo has often been described as the archetype of the Renaissance Man, a man of "unquenchable curiosity" and "feverishly inventive imagination". He is widely considered to be one of the greatest painters of all time and perhaps the most diversely talented person ever to have lived. According to art historian Helen Gardner, the scope and depth of his interests were without precedent and "his mind and personality seem to us superhuman, the man himself mysterious and remote". Marco Rosci points out, however, that while there is much speculation about Leonardo, his vision of the world is essentially logical rather than mysterious, and that the empirical methods he employed were unusual for his time.

Lauren Fix is a Buffalo, New York based automotive expert. She has authored three books on automobiles. She has occasionally appeared on CNN and Fox News.

Fix began racing in New York in 1981 in the SCCA Solo II Series. She debuted with a third place finish. By 1989, Lauren evolved into a road racer and started winning in her historic 1966 Trans Am Mustang. She competed in SVRA, HSR and the Canadian G.T. Challenge Cup sanctioned by FIA. Lauren operated the Driving Ambitions Performance Driving School at Watkins Glen International Raceway from 1986 to 2001.

Fix co-hosts Talk 2 DIY Automotive on DIY, providing demonstrations and tips for auto repair. Lauren has appeared in several magazines including Redbook, USA Today, and Woman's World. She hosted the television show local TV networks called Car Smarts and has been featured on several national television shows including: Oprah, Fox News, 20/20, The View, Live with Regis and Kelly and CNN. Lauren Fix is a regular guest expert on CNBC On the Money, with Carmen Wong Ulrich.