I have used AMSOIL 100% synthetic oil www.ExtremeDutyOil.com since 1995. I have gotten 20% more MPG hwy consistently. I change AMSOIL once a year  or every 25,000 miles, along with the new technology nano fiber oil filter (98.7% efficient). 

Virtually eliminates wear and you use 80% less oil. One case of AMSOIL and two nano fiber oil filters takes care of the average car for two years. Free Catalog.

So you have a lot to gain! And nothing to loose by trying new ideas! There is no warranty issue because of the Magnuson-Moss Warranty Act. on top of the you have the AMSOIL warranty.

I save about $550 on gas (usually more), $50 on oil, $35 on oil filters, $100 on labor, which is about $750 a year total.  AMSOIL handles -55 F below zero and extreme heat to about 500 F degrees. 

If we cut our oil/diesel/gas usage any way possible, then we can dry up profits for foreign oil baron countries and drastically reduce their ability to support terrorism. We reduce pollution, you put money back into your budget and enjoy life more, worry less. 

The alternative is not acceptable; if you don't fight back you lie down and take it!  You go broke, and contribute to a negative economy! Your family suffers more! You put up with being humiliated by thugs that hold you hostage with oil! You sit at home forever!

For me, I choose to FIGHT BACK and get double my MPG any darn way I can!  Why don't you join me?

http://www.MPGdoubled.com 

http://www.ExtremeDutyoil.com