The only fuel additive I ever use is Marvel's Mystery Oil. It helps in
keeping the injectors clean. Just use once in a while. A little in the
oil periodically helps keep the lifters in good operating order by
adding a little more cleaning action.

With the spiking fuel prices, the very best thing you can do to fight
the high fuel prices is to keep your vehicle well tuned and frequently
serviced. Outside that - drive at the speed the vehicle was designed for
- 55 mph on the open road. That will give you the maximum fuel economy.
If we all went back to that speed as the official highway speed and
enforced it - we would go a long way to reducing the demand for oil.
Want to burn a lot of high priced gas in a Vanagon? Drive fast.

John

John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com

On 3/9/2011 10:27 PM, PB wrote:
> Nothing's wrong with my Westy, but would like to know if STP gas
> treatment will increase mileage and enhance performance.
> Patti
> 90 Westy Automatic
>
>