# Gas Mileage Questions

**URL:** <https://forums.speedlife.net/t/gas-mileage-questions/15836>\
**Category:** NYSpeed Automotive\
**Created:** [August 11, 2006, 1:28pm UTC](https://forums.speedlife.net/t/gas-mileage-questions/15836 "2006-08-11T13:28:15Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Bigairskier1580](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bigairskier1580/32/7612_2.png) [@Bigairskier1580](https://forums.speedlife.net/u/Bigairskier1580)\
**Post date:** [August 12, 2006, 11:44am UTC](https://forums.speedlife.net/t/gas-mileage-questions/15836/6 "2006-08-12T11:44:18Z")

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Downhill coast in gear FTW.

Watch o2 sensor voltage readings. Down hill, they will read 0 volts if you are in gear (any gear, regardless of engine speed). Coast down the same hill in neutral, and you will get voltage readings as the car will be burning fuel to keep running.

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