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Originally Posted by Dr. Jerryrigger
I think most of us here are broke *** more than environmentalists. But using less fuel at any cost is a noble cause.
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x2. I'm here because I can't afford to waste money that could be saved, and one area of my life where I'm willing to put in the effort to save is with my driving. I tend to answer questions from that point of view, often forgetting that some people have different motivations.
In that case:
Air filter - No. Do the math, replacing the air filter when it's not making a significant dent in your FE is bad for the environment. Consider the entire life cycle of an air filter: Materials are mined, refined, made into raw materials for manufacturing filters, then they are
manufactured, then packaged (and you can consider the life cycle of the package), shipped, used, and then they get thrown into a landfill because they can't be recycled.
Environmentally, you should clean your air filter, and eventually if it manages to reduce FE (and the EPA's tests show otherwise), then replace it. Once it needs to be replaced, perhaps an oiled cotton gauze filter could be more environmentally friendly, because it is reusable and because cotton is probably more eco-friendly than paper.
Computer programming - This would be the big one. Find someone who can do completely custom tuning and is willing to work with you to adjust the tune until it's right for you. You won't find a tuner who has a lot of experience with fuel economy (since 100% of the tuning market is for performance), but if you find one who has a good fundamental understanding of how engines work, is patient, and open-minded...it could work.
Have him make torque converter clutch locking and DFCO very aggressive, let you open the throttle more without downshifting and with lower shift points, eliminate open-loop fuel enrichment under WOT, and experiment with lean burn cruising. Those are a few suggestions I can think of off the top of my head.
Spark Plugs, exhaust, synthetic oil - Not going to help FE or the environment. Well, synthetic oil will help FE slightly but I suspect that the energy put into it far outweighs the environmental affects of increased FE.
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N/A as you don't have a diesel. but a fun fact: animal fat gets you further than veggie
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If you're burning waste oil, both are probably free and both should work fine in the same system. I wouldn't mind seeing WVO systems that also burn waste motor oil. Actually, I suspect that you can just dump it in without a problem (obviously, you'd have to filter it as well as you filter the WVO).