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Old 12-27-2007, 11:49 AM
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Default Loss in fuel economy

I have recently noticed in the past couple of weeks that I have been lossing about 2-3 mpg, which equates to about 25-30 miles to the tank. I had been obtaining about 400+ miles per tank, now I am lucky if I can stretch it to 370-375. I do religous maintnance on the vehicle with all synth. fluids. Changed the plugs about 30000 mi. ago, air press. in tires is at adequate level. Any suggestions?
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Old 12-27-2007, 02:39 PM
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Default RE: Loss in fuel economy

Welcome to the forum.

It's the winter gas formula.
"The oxygen-bearing compounds displace fuel components, so it takes more fuel to get the job done. Normal gasoline has a stoichiometric ratio of 14.7:1, reformulated winter fuel runs between 14.3 and 14.4:1," says Mitch Markusich.

To read the whole article>>>> http://zhome.com/ZCMnL/PICS/winterGas/winterGas.html
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Old 12-27-2007, 02:44 PM
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Default RE: Loss in fuel economy

thanks for the reply, sounds good to me.
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Old 01-10-2008, 11:41 AM
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Default RE: Loss in fuel economy

I agree. The winter gas here in the N/E really takes a bite out of MPG. I'm waiting for them to say it will be used year round. Tom
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Old 01-10-2008, 10:37 PM
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Default RE: Loss in fuel economy

Word.
On about 95% highway from York to Ocean City MD, we can only manage about 29.5 but thats using the A/C most of the time.
Now, she is happy to pull in 23 in mixed driving.
B
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Old 01-11-2008, 03:01 PM
 
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Default RE: Loss in fuel economy

Wow, I am actually having the same problems and I think you guys might have answered it for me.
I am currently only getting aboiut 260 on a tank, usually get around 305 or more.

Also if you guys can help I have an interesting question, my 2001 Volvo S40 cant receive any more fuel then 11 gallons. According to my manual and websites I should have a 16gallon tank. Now my question is, could the problem be a faulty gas gauge, or something wrong with my gas tank pressure. My needle never reaches MAX completely, and always drops to 3/4 whithin 3 times of starting the car or when I hit 30miles on the tank. Any suggestions?

Thanks!
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Old 01-12-2008, 09:42 AM
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Default RE: Loss in fuel economy

Several members here have been speculating on this. According to this thread (https://volvoforums.com/m_89165/tm.htm), the tank does hold 16 gallons. The car will show on E about 11 gallons or so. You actually have 5 more gallons left in the tank. Is this a safety feature so you never run out of gas? Is this a flaw in the fuel sender? Only the Volvo designers know......
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