fuel saving devices

[etlsport]

http://www.cnn.com/2006/TECH/science...ion/index.html

confirms what many of us already thought.. lots of fuel savers tested, not a single one was found to work.. including the tornado, which was shown to actually decrease fuel economy on a navigator

my stock vx gets 17.5-18.5 in a combination of city and highway, 19 sometimes now that I put a green performance air filter in and removed the elbow into the stock airbox.. lookin to get a new muffler soon, anyone have experience with mufflers that increase fuel econ?

[blacksambo]

I've found the more you boost performance ie, better air filter etc. the worse gas mileage you get. Performance=reduced gas mileage, period. Now on ther plus side some tricks that do work are boosting tire air pressure from 29lbs to 39lbs. Also, Lucas gas treatment/injector cleaner really does work in lifting mileage a couple of points. For what it's worth.

[SPAZZ]

more air flow...especially cold air flow makes for better efficient mileage not worst mileage. Not sure where you learneded

Heavier foot makes for not so efficient mileage.

[blacksambo]

I know it sounds crazy but more air flow than OEM spec drags down mileage. I see this in practice in my '99. For example, I changed to the K&N filter and saw the engine idle move from spec 750 to 850 consistently, with only the air filter change nothing else...need I prove more? performance enhancement=lower mileage every single time. Stick with the spec air induction system for max mileage.

[SPAZZ]

I put in a Calmini air filter and have been receiving 30 more miles per tank over stock air box. So instead of 200 miles per tank I started receiving 230 miles per tank.

[Ldub]

Double Hmmm...

I'm s/c'd with a K&N reverse cone on the end of an insulated c/f tube & a Borla muffler, & average 16.5-18 hwy., with an all time best of slightly over 23 going over (upside & downside) Vail pass.
I still think the farther west you go, the better the gas.
Yes, my in town mileage sucks, but that's my fault for having an addiction to G-force.

[blacksambo]

I put in a Calmini air filter and have been receiving 30 more miles per tank over stock air box. So instead of 200 miles per tank I started receiving 230 miles per tank.

For reference, I'm getting 20mpg (400 miles+ per tank)with the stock air induction system on my wife's '99 (we both drive it so that rules out the foot factor), and it consistently idles at 750 rpm.