Do Gas Savers work? — PinoyExchange

Do Gas Savers work?

Some people have told me that they don't really work. Is that true from your experience or knowlege? Then why do they have all these awards and even DOST approval on them?

I also heard a certain Danilo W who advertises them in Buy n Sell sells an alternative to Khaos.Yet, some report he is a scammer.

What is the truth behind these gas savers?


  • I heard two friends who had those Khaos, one in his Escape and the other in Lancer, say they are useless. I have not tried one--with my gas consumption, I would only enjoy its 20% savings (if it does at all) after more than one year. My mechanic though, when I purchased a van (with 2.7 gas engine), installed his personally fabricated "gas saver" apparatus (a used refigerator dryer, he says), I really noticed substantial improvement in my gas consumption both in the city and in long drives. I also noticed na maganda ang exhaust ng van, hindi hilaw. And I did not even pay for the apparatus, which he says he normally sells for P900. I dont know if it's the same.
  • aIJay
    aIJay apathetic...
    Khaos and all those other device do NOT work and are just a waste of money. It's all just marketing hype that is full of false advertising and in most cases is actually BAD for your engine and for the environment.

    All of his claims that so and so company offered him millions for his device are just a flat out lie. The truth is hindi talaga siya ang inventor nun. That type of device is widely known and well understood. Just search Google for "Air Bleed Device" and you'll see what I mean.

    Bottom line is the best gas saving device is your right foot.
  • heightdeprived
    heightdeprived Assistant Member...
    just keep your car as it is, period :)
  • yep... his methods for saving gas is simple: more air intake. :|

    i mean if it really does save gas, edi lahat ng car companies use it na.

    may computrs na ang cars natin that controls things like air flow already. if the formula ng khaos is optimum, matagal nang prinogram ang comptuer ng cars natin na gawin yun.

    ganun lang ka simple ang rason.
  • OTEP R
    OTEP R Admin
    Gas savers are crap. I keep wondering how people are so easily duped by them.
  • shun_sakurai
    shun_sakurai when in doubt, FLAT OUT!
    Agreed, the best "gas saver" is still the driver.

    How you drive and how you maintain your car will make the biggest difference in fuel economy, not some device someone whipped up in a shed.
  • I actually agree with all of you that is safer and better to just keep the engine as originally made. Nanloloko lang pala yung mga traders na nagbebenta ng mga "gas-saving" device--at kasabwat pa ang DTI?!! Pero siguro, pag luma na ang engine (10 years?), pwede yung mga device na nagde-deliver ng supplementary air to improve fuel combustion?
  • shun_sakurai
    shun_sakurai when in doubt, FLAT OUT!
    There's a specified air-fuel (A/F) ratio that's supposed to be kept constant in car engines. The ideal is about 13 parts air to 1 part fuel.

    What a lot of these fuel savers do is deliberately upset this stoichiometric A/F ratio by introducing too much air in the mixture. Doing that means your engine runs "lean" on fuel and your emissions suffer badly.

    On modern fuel-injected engines with oxygen sensors, such devices will just fool around with the normal operation of the car. Older engines won't be as picky as they've got a lot less electronics, but the consequences of running your engine too lean---"detonation" and knocking---are still there.

    Try visiting Chris Longhurst's Car Bibles ( for more info.
  • Thanks, shun. Is it therefore possible to reduce the quantity of both air and fuel without affecting their ratio? In this regard, are there engines designed to adjust fuel consumption (less than idle), torque, etc, without losing traction when running downslope? Not much in saving fuel, but my interest mainly is in reducing toxic emission by-products.
  • shun_sakurai
    shun_sakurai when in doubt, FLAT OUT!
    There are aftermarket gadgets like the APEXi SAFC/VAFC lineup that cater specifically to addressing proper A/F ratios, but most of the time they're used for cars with aftermarket turbos installed.

    Proper A/F ratio is a lot more critical for turbocharged engines because a turbo is basically an air compressor. The same way, engines are basically air pumps. Compressing air means you can jam a lot more of it into the engine, hence more power...but more fuel has to go along with it too to provide the bang and prevent "detonation."

    In recent times there have been engines with "lean-burn" modes to help keep fuel consumption at bay, although I don't know of any which have made it here. Alfa Romeo's JTS (Jet Thrust Stoichiometric) gasoline engines from 2003 are an example: below 1500 RPM the lean-burn mode kicks in and alters the A/F ratio from 13:1 to 60:1. They seem to have addressed the emissions issue somehow.

    With regard to emissions, carmakers have gotten pretty clever in reducing them. Most of the innovations revolve around igniting the catalytic converter sooner to make it more effective. The Bluetec diesels soon to make their debut in the US have introduced new urea-based catalysts to reduce soot, NOx and other particulates---in a bid to finally sell clean diesel cars there.
  • shun_sakurai
    shun_sakurai when in doubt, FLAT OUT!
    rendaku wrote: »
    Thanks, shun. Is it therefore possible to reduce the quantity of both air and fuel without affecting their ratio?
    For all the long-windedness of my previous post, my answer to this question is short and simple:

    Go easy on the gas pedal :D
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