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Possible to Double MPG With Fuel Additives? Answered

There is a big movement going on about making your car get better gas mileage with different kits and fuel additives. I read about Ethos over atIncrease Gas Mileage Increase Gas Mileage.

Is it really possible to increase your gas mileage with simple solutions?

Maybe the oil industry really is trying to keep a tight lid on this whole industry....

Tags:gasfuel

14 Replies

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hadehnicholes (author)2009-08-12

put acetone in gas tank 2-3 ounces per 10 gallons of gas

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Austringer (author)hadehnicholes2009-08-30

You know, you can work out the energy you're going to get for a given fuel using a table of bond energies (like this one: http://www.saskschools.ca/curr_content/chem30/modules/module3/lesson5/bondenergy.html) and basic math. Add up the bonds in your reactants and subtract the bonds in your products.

I've heard it argued that injection of low levels of hydrogen change the way combustion happens and so you get more push at the beginning of the stroke and so your more efficient and the energy from burning the hydrogen is trivial relative to that. I'm not sure I believe it.

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hadehnicholes (author)Austringer2011-01-02

the hydrogen gas does work but it only gives you a few miles better nothing much unless modify you EFI system which I think is stupid

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PKM (author)Austringer2009-09-01

Austringer: thanks for the link, I'll remember that one next time I need to find best-case energy output from burning fuels. However, I'm not sure how applicable it is here- I'm pretty sure watering down fuel with water 50:50 would reduce the power output of the engine by more than a half. I think the claim is the inverse of this- adding a small amount of something like acetone may make the engine more efficient.

I've heard it argued that injection of low levels of hydrogen...
The people discussing adding hydrogen to car ICEs seem to fall into two camps. One side believe that judicious addition of hydrogen may change the dynamics of how the (notoriously inefficient) engine works, and perhaps enable it to make better use of its standard fuel and get better gas mileage. I certainly believe this is possible, as it doesn't break any established laws of physics.

The other side think that with some sort of magic involving "frequencies", an engine can electrolyse all the hydrogen it needs to run from water using only its own power output, in clear violation of the laws of thermodynamics. They then point to some spurious patents, "Big Oil" conspiracy theories and people making vague and ambiguous claims about hydrogen injection on their car engines as "proof" of this demonstrably impossible claim.

I wish it were possible to separate a demonstrably plausible technique for increasing engine efficiency from a demonstrably impossible design for perpetual motion and focus on the former, but some people will insist on confusing the two. I even drew a diagram explaining the difference but that didn't work so I've more or less given up arguing against the hydrogen perpetual motion crowd.

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PKM (author)2009-08-12

This is one of the biggest secrets the oil companies do not want you to know.

Wow- good thing there's a website about it then, isn't it?
(/snark)

It is possible to increase your mileage with simple solutions, that's the basis of the hypermiling movement. Buy a smaller, lighter, more fuel efficient car, and don't carry excess weight; drive it more "sedately" avoiding harsh acceleration and braking; keep your tyrestires rubber-wheel-bits inflated correctly, and don't run your A/C all the time or have open windows at high speed.

Doubling your mileage by putting solvents in your fuel, magnets in your engine bay or pyramid power crystals in your glove box sound like snake oil to me. I'm still undecided either way by water injection or "the mixture of gases that results from splitting water" (trying to avoid any spambot trigger words) but it might work, as might solvents in the fuel, but I suspect that it would work better on an inefficient old engine than a newer, properly tuned fuel injected one.

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yourcat (author)2008-10-03

Water injection. turns to steam in the cylinder, turns the engine's excess heat into kinetic energy.

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NachoMahma (author)2008-09-23

. You can obtain small gains with lower viscosity oil, &c;, but anything claiming more than a few percent is highly suspect. . One cause of low MPG, especially here in the US, is excess weight - smaller, lighter cars just naturally get better mileage.

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westfw (author)NachoMahma2008-09-27

So how come US cars seem to be routinely heavier (and otherwise get worse mileage )than otherwise approximately equivalent European cars (even from the same manufacturer)? Is it harsher safety standards in the US adding weight or something?

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NachoMahma (author)westfw2008-09-29

. I'll guess it's customer preference, ie, too many Americans with the bigger-is-better attitude. (I like a V-8, which requires a heavier frame and suspension.) . Streets in Europe are quite narrow, compared to those in the US. This would discourage most ppl from purchasing large cars. . IIRC, cars are taxed by size and weight in Japan, which would encourage smaller, lighter vehicles. . I'm assuming safety regs are similar enough to not make much difference in the weight, but don't know if that's actually true or not. . It would be interesting to see how vehicle size is distributed in the US. Would LA, NYC, &c; tend toward smaller, lighter cars?

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SKINZ (author)2008-09-27

i dont know bout additives but simple thigs like keeping your windows closed and not having the air con on will save fule even having your raidio on uses a tiny bit of fule

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skunkbait (author)2008-09-26

No Way!!! I've experimented with xylene and acetone as additives with decent gains (3-4 mpg). Doubling your mileage with additives alone.... impossible!

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Kiteman (author)2008-09-23

I just found out at the weekend that the old Isetta Bubble Cars got 50-70mpg under normal driving conditions, and up to 90mpg if driven carefully. There are rumours of a resurrection, with the new version getting 100mpg. No additives, just a small, light engine in a small, light car.

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killerjackalope (author)2008-09-23

Not a chance, unless you added twice the fuel!

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