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Anyone seen this gas mileage idea???????

dirtwarrior17 said:
... try running 87 octane for a tank then run 91... you will get alot better mileage with the 91 octane. that is why some people don't mind buying 91 all the time.
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Best fuel to use is what is recommended in the manual....

think of it this way..
if a car runs efficiently on 87 oct and you put 91 in.. the car has to "Work" harder to burn that fuel and can even hurt you... this is a proven fact.. unless you have a higher compression motor like the new rustang, gto or something like that....
my dd is a 1996 camaro 3.8 with k&n I get 21-24mpg highway...with 87 oct
my wifes dd is a 1996 jimmy 4 door and I run 87 oct and k&n and this weekend we got 21mpg for 8 gallons (filled up as I needed coffee due to falling asleep) then got 24mpg for the rest of the tank...

everyone seems to bash the k&n...
on my camaro I went from 16mpg to 20-23mpg
on my jimmy "He Said JiMMy" I went from 18mpg to 21-24 and saw 26mpg once.....

my fullsize truck just sucks.. speedo isnt accurate so cant calculate mpg with it.. but have a k&n for that too.... :grin: however gas isnt too bad on that one either....


now years ago when I had 33's I used to run regular (87) gas all the time and would use 1/2 tank going to my moms and back.. I started putting 93 oct in and 104oct boost in every tank.. then I started getting better mileage.. went to my moms and back on 1/4 tank now....

I just say if ya dont wanna pay for gas then buy a beater... or a vw golf diesel.. 50mpg.. or a honda insight hybrid.. 77mpg or even a geo metro can be had for <$1000 as a guy at work got one for $300 and gets 45mpg......

but hey this is all my $0.36 as inflation is gettin bad :p:
 
WOW! LMAO at the people who use their fuel gauge to tell how many gallons they used!

:rolleyes: :rolleyes: :rolleyes: :rolleyes:

For something like this, reading a needle only gets you a rough estimate. The full tank and refill method is a hell of a lot more accurate (given the auto stop on gas pumps, just, filler to the filler tube).
 
RootBreaker said:
everyone seems to bash the k&n...
on my camaro I went from 16mpg to 20-23mpg
on my jimmy "He Said JiMMy" I went from 18mpg to 21-24 and saw 26mpg once.....
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That sounds slighty ridiculus....I think you had a clogged air filter before you changed to a K&N filter charger.
 
BigBurban350 said:
That sounds slighty ridiculus....I think you had a clogged air filter before you changed to a K&N filter charger.
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Im not going to get into that again....
new paper filters were not better for me... maybe climate, weather or other factors changed things.. but i have gotten 2 other people to buy k&n and they swear by them now too
 
RootBreaker said:
Im not going to get into that again....
new paper filters were not better for me... maybe climate, weather or other factors changed things.. but i have gotten 2 other people to buy k&n and they swear by them now too
Click to expand...

In any case, my burban IS filter charged by K&N :thumb:
 
In my never ceasing string of non-scientific tests done to my truck, I've gotten under 10mpg on the last tank with NO acentone added... with a 22 gallon fillup, I've gone less than 200 miles since my last fill, and have under a quarter tank of gas left for the rest of the week. All of my driving, or at least 90% of it was done at 65mph, and the rest was common stop-n-go driving. I did not notice any power change with or without acetone, but there is definitely a mileage change with it...
 
jms said:
Just clarify for me, please: you've got a brand new engine, ran it with acetone added to the fuel, got a bit better mileage, but now your engine has a tick/noise, correct?
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or it could be the fact that a new engine is still in the break in period. And the rings are seating and causing the increase in fuel mileage. but a ticking noise, thats bad.


heres something for phoenix. :D
http://www.straightdope.com/classics/a1_263.html

notice the cartoon drawing how the bottle is half full, but the gauge says "full"
 
The ticking was there when the engine was first fired up, before any acetone was added, and the shop (and the engine builder) attributed it to breaking in. I think it's a sticky or loose lifter, and it will be fixed when I go for my next oil change. The shop also said it's been present in every one of their race built chevy motors, and that it's very common on a new engine.

The shop has been building race motors for 30 years or so... and most of the time, they know what they are talking about... but just to set your mind at ease, I'm not taking what they said as law, which is why I'm having them look at it next time I go in.
 
*Update*

SO I finally filled up again, and without posting a lot of crap about it, my before acetone mileage was 17.1 mpg, and AFTER using it on the last tank it went up to 18.9. Not a huge increase, but that actually comes out to about $5 per tank savings in gas. Less the .75 cents it costs per tank for the acetone, I am saving about $4.25 a tank. I'll take that even if it is not a huge $$ amount.

And again my DD is an 89 Isuzu Trooper w/ the 4cyl, fuel injection and 195,000 miles. Kinda sad that such a powerless POS gets such pathetic mileage.
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Just started this experiment in my Mazda.

The first tank showed little or no difference but I only used the very low end of the recommended range of dosage.

Fuel economy over last 71 tankfuls:
Average: 27.28mpg
Max: 30.97mpg
Min: 21.47mpg

Acetone: 0.07%
Mileage: 28.63mpg

I just filled up and used 0.13% Acetone, so we'll see what happens.
 
Hmmm.... i just got a free 1984 honda accord hatchback... maybe now i'll try it since its not my 355. By the way to prevent arguments when i said i'll never try this i meant in my 355. The honda has 230,000 on the motor so i figure what the hell.
 
dirtwarrior17 said:
Hmmm.... i just got a free 1984 honda accord hatchback... maybe now i'll try it since its not my 355. By the way to prevent arguments when i said i'll never try this i meant in my 355. The honda has 230,000 on the motor so i figure what the hell.
Click to expand...

drop the fuel tank. Put in a plastic tank(1 gallon). Jack up the wheels that are connected to the drivetrain. And run it till it dies. Find out how long it takes. You should also get a mileage if the speed pickup is in the trans.

Then try it again with different amounts of acetone.


But to make it more realistic. Run the car with some fuel injection cleaner, before you do the test.

After your done, put a big wing on the car and drive it off the cliff. :D
 
LOL.... I got enough to do on my truck.... i don't need to waste my time with my aunts old POS honda.

still it gets me where i want to go and does it with 30+ mpg :D
 
My experiment is now complete.

Vehicle: 2004 Mazda3 hatchback
Engine: 2.3L 4-cyl
Transmission: 5-speed manual
Driving style: Normal to Agressive

Fuel Economy from May 8-June 16 2004:
No acetone; 7 fillups; 29.32 mpg max; 28.05 mpg min; 28.75 mpg average

Fuel Economy from May 4-June 18, 2005:
varying amounts of acetone between .07% and .25%; 8 fillups; 31.18 mpg max; 28.25 mpg min; 29.35 mpg average

Fuel economy for the tank immediately preceeding experiment:
30.30 mpg

Fuel economy for the tank immediately following the experiment:
29.60 mpg

Change in Fuel Economy:
+0.60 mpg with acetone

Conclusion:
No bloody difference.
 
i would have liked to see numbers for the next week after the acetone using just regular old gas again... might help prove the idea I put forward that the acetone does help clean out a fuel system but doesn't do much else....

j
 
I did the readers digest version and got the same results. :D

Rene
 
OK, I just read every f*cking post in this thread and my eyes are bleeding. Here's a test method that eliminates the human factor. Use a lawn mower. Put in a measured normal mix of gas (say 1 cup), tie the mower down so it doesn't wander and time how long it runs. Let the mower cool back down for an hour or so then add 1 cup of acetone mix and run the mower. If it runs longer than the mix is possibly more effecient. If you want to get really particular run say 3 goes with straight gas and average your results (remember to have a cooldown between each run). Then do 3 runs with the mix and average your results. After the mix runs try running straight gas again. If there is a time increase with straight gas after the mix runs then the increased mileage is due to cleaner engine internals. If this is the case then you could keep doing runs with straight gas noting when the running time detieorates. Then add the mix again.

Seems simple enough to me. I have yet to see a FI lawnmower but combustion is combustion and I don't think the chamber really cares where the fuel comes from as long as it's close to the correct ratio.
 
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