# Mpg-caps

**URL:** <https://community.cartalk.com/t/mpg-caps/6997>\
**Category:** Maintenance/Repairs\
**Tags:** fuel-economy\
**Created:** [November 7, 2007, 11:38pm UTC](https://community.cartalk.com/t/mpg-caps/6997 "2007-11-07T23:38:18Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Cat52](https://avatars.discourse-cdn.com/v4/letter/c/dfb087/32.png) [@Cat52](https://community.cartalk.com/u/Cat52)\
**Post date:** [November 7, 2007, 11:38pm UTC](https://community.cartalk.com/t/mpg-caps/6997/1 "2007-11-07T23:38:18Z")

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I’ve seen these advertised as additives to the gas tank to improve mileage. Is there any truth to the claims?

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [November 7, 2007, 11:40pm UTC](https://community.cartalk.com/t/mpg-caps/6997/2 "2007-11-07T23:40:36Z")

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No. None. Zero, Nil. Zilch.

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**Author:** ![DARTMAN69](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/dartman69/32/29_2.png) [@DARTMAN69](https://community.cartalk.com/u/DARTMAN69)\
**Post date:** [November 7, 2007, 11:42pm UTC](https://community.cartalk.com/t/mpg-caps/6997/3 "2007-11-07T23:42:28Z")

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Click the link below and it will take you to the last thread explain the quality of this product.  
[http://community.cartalk.com/posts/list/493011.page](http://community.cartalk.com/posts/list/493011.page)  
~Michael

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [November 7, 2007, 11:46pm UTC](https://community.cartalk.com/t/mpg-caps/6997/4 "2007-11-07T23:46:50Z")

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Buy a bottle. Put one on the edge of your dash. Drive softly such that it never falls off. You’ll save gas. Guaranteed.

They’ll do absolutely no good in your gas tank.

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**Author:** ![Beadsandbeads](https://avatars.discourse-cdn.com/v4/letter/b/c57346/32.png) [@Beadsandbeads](https://community.cartalk.com/u/Beadsandbeads)\
**Post date:** [November 8, 2007, 12:22am UTC](https://community.cartalk.com/t/mpg-caps/6997/5 "2007-11-08T00:22:04Z")

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They absolutely do. In fact, if you send me twenty five bucks, I will send you my own personally-developed, tailored to your car, formula containing the combination of these off-the-shelf commercial additives that will actually allow you to produce fuel while you drive. (Individual results may vary.)