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Old 03-18-2008, 11:07 AM
Mr.Kenny's Avatar
"Just Passin' Thru"
Join Date: Sep 2005
Location: Springfield,MO
Posts: 277
This Improving gas mileage site;... whatta ya think?

The acetone & xylene & oil mix? Does this work? Plus his other suggestions? What is horse shat and what is truth?


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Old 03-18-2008, 11:19 AM
Benzadmiral's Avatar
Chief Enforcement Agent
Join Date: Jul 2004
Location: New Orleans, LA
Posts: 340
I doubt it

An ounce or two of 5W-40 engine oil in your fuel? Wha--?

Though the acetone shouldn't hurt, and might not cost too much to try.
* *
-- Paul W. (The Benzadmiral)
('03 Buick Park Avenue, charcoal/cream)
'97 C230, smoke silver/parchment; '86 420SEL, anthracite/light grey; '84 280CE (W123), dark blue/palomino

Last edited by Benzadmiral; 03-18-2008 at 12:05 PM.
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Old 03-18-2008, 10:12 PM
Registered User
Join Date: Dec 2005
Location: Carson City, NV
Posts: 3,789
Item by item:

1. Poo

2. There are plenty of reasons to run good oil, and some oils will return better MPG than others (slightly), but it won't get you a 25% increase. Also, that site is suggesting thicker oils than are required by a lot of newer engines. This will not improve MPG.

3. Just like #2, there are reasons to run synthetci ATF, but MPG is not one of them.

4. Yes and no. If your evil spark-ignited engine is missing, change the plugs. If it isn't, changing to this or that brand may get you a slight improvement in mileage, but don't expect much. And don't go making large changes to the plug gap without knowing what you're doing and why you're doing it.

5. Yes, bad or clogged filters can hurt mileage. You don't have to run Dondaldson or Baldwin filters (though there's nothing wrong with them). If your current filters are not clogged, dirty, or old, changing them is not going to help you.

6. Theoretically, this seems to be true. I would like to see experimental data to show how well that actually works in the real world. (I had to get out my old thermodynamics book from college for this one)

7. Maybe. It's true that bigger tires will reduce the number of engine revolutions per mile in top gear, but they also have more mass and more rotational inertia, and probably higher rolling resistance. You might getter better mileage from going to a larger diameter tire, or you might not.

8. True.

9. True. Ethanol has less energy content per gallon than gasoline.

10. True.

11. True to the extent that any of the named sensors, if not performing properly, will kill your mileage. I would add that O2 sensors often go bad slowly so that they will give sub-par performance without setting a trouble code. If the MAP of MAF fails, it will set a trouble code immediately, but the MAF can be simply dirty which may or may not set a code and can adversely affect engine performance including mileage.

12. True

Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 367,xxx miles
08 Triumph Street Triple 30,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
88 Jaguar XJS V12 93,xxx miles. I should be in the garage now.
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