now you hear here an there on TV and word of mouth people talking about MPG nowadays with todays gas prices. i watched some TV show on the speed channel about gaining MPG HP&TQ by changing to synthetics. they used a 95-96 chev 4x4 truck and changed all the fluids over to royal purple synthetic (engine,tranny,transfercase, diffs.) and they gained like 3hp and 2lbs of torque and some MPG. i've been thinking about it and trying it on my 97 S15 4dr GMC Jimmy 4X4 with the 4.3 vortec. i average around 15 - 17 MPG the highest i've ever got was 18-20 babying it and driving like grandma but otherwise i have a little of the lead foot syndrom but its income tax season and i'm going to give her a tune up and really go through it change the filters over to K&N change all the fluids over to synthetic and start running premium and see if you really get your bang for your buck and if its not worth it this will be the one time and only time i do this.

have any of you tried this or hear of people doing it ????