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Not that I'm complaining . . .

Anyone know why my fuel consumption would suddenly go from years of 26 mpg to about 33 mpg? It started about two weeks ago, with the only new occurrence being a change from Sunoco gas to Citgo. I can imagine there being some minor difference between the two stations, but enough for a

25% increase in efficiency? If it is the gas, any idea what aspect of

engine operation would be affected?

FWIW, '98 SL2, 68K mi, located in Central New York, most trips K'93 snipped-for-privacy@ocf.berkeley.edu

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Reply to
Louis Hom
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I find that my '01 lw300 seems to like some gas better than others. I usually average about 300 miles per tank (15 gallons capacity) on getty regular grade. I got some Amoco the other day and got almost 400 miles on the tank. Same driving patterns so I can only assume that the engine likes the Amoco additives better. Admittedly, this is not a scientific test. I don't keep records of how many gallons go into the tank so MPG is vague at best.

Bad O2 sensors will usually drag down your mileage. It's also possible that the different gas you used cleaned off a marginal sensor and improved the mileage. Oppie

Reply to
Oppie

Maybe Amoco pumps put more gas in a tank for a fill up.

Reply to
Art

Entirely possible... Also the flow rate from the pump. On the L series, there is a variable orifice on a float to the tank vent. It's supposed to cause the filling pump to shut off when the tank approaches full. You can get more fuel in the tank by filling slowly. I'm an engineer but not anal-retentive about keeping records on mpg . Being a bit mentally overloaded (overwhelmed) at work, I reserve all experimental protocols for the paying job.

Reply to
Oppie

Well hopefully you arent trying to estimate your fuel consumption via the fuel gage.

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blah blah

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