Daniel J. Stern wrote:

> On Mon, 24 Jan 2005, ant wrote:
>
>
>>jcwhitney sells a mpg gauge that is claimed to work on 'all cars'
>>
>>http://tinyurl.com/547yk
>>anyone tried this? how does it install/work?
>
>
> Looks like nothing more than a vacuum gauge, to me.

Indeed, those have been around for at least fifty years, and WERE just
vacuum gauges.