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Fuels & Lubricants Discussion all about Fuels & Lubricants. synthetic oil, conventional oil, brands, change intervals, diesel grades, gelling and such debated items like that. Non TDI related postings will be moved or removed. This forum is NOT for the discussion of biodiesel and other alternative fuels.

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Old May 26th, 2011, 17:35   #1
plyyyy
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Join Date: May 2011
Location: Redlands, CA
Fuel Economy: 43.2 so far
Default Is there a difference between diesel fuels in CA

I just bought a 2000 Jetta TDI 5 spped. The car is awesome and I have driven over 300 miles on less than a half a tank of gas. I was looking at the Gas Buddy app on my phone and was noticing that the 2 gas stations that are closest to my house differ in price about 35 cents a gallon for diesel. One station is an Arco and the more expensive is a 76. Is the Arco diesel ok to use in our TDI's? I would never run Arco in my other vehicles because it has always been known as "cheap gas". I appreciate your feedback. Hopefully this info. is not right in front of me and I am just not seeing it.
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Old May 28th, 2011, 14:55   #2
tdiatlast
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Location: Fort Worth, Texas
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Is there a penalty for double-posting? I suppose not, but try to remove one of your threads, or ask a moderator to do so...
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Old May 28th, 2011, 15:41   #3
ruking
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Join Date: Mar 2003
Location: San Jose area, CA
Fuel Economy: 62/50/44mpg, normal commute range 48-52 mpg:09 Jetta TDI, 47/43/39, normal commute range 39 -43 mpg: 12 Touareg TDI, 39/31/29 mpg:
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I think you might want to make the measurement a tad bit finer, as in mpg 49.75, and over one two three tank fulls. Then you can see if there are gradation differences (.25,.5 .75, 1 mpg). What you are trying to do here is to even out or compensate just for measurement error over several tank fulls. So for example, if you had filled with Arco and got 50 mpg (on your half a tank) and re TOPPED with 76, you just mucked the variable/s.

If you do notice a difference, then the next question: is it worth the premium????? I have normally bought on price (cheapest) and secondarily on convenience. I have done this over 184,000 miles.

Here is an illustration:

a. 50 mpg /$4.33 per gal ULSD = .0866 per mile driven.

b. 55 mpg / $4.33+.35 (premium)=$4.86 per gal ULSD = .085 per mile driven. In this example, 5 mpg better is SLIGHTLY better (1.9%) @ .35 per gal more (premium).

c. now @ the same prices, the one that gets better mpg is better.

Last edited by ruking; May 28th, 2011 at 15:49.
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Old May 28th, 2011, 16:19   #4
1854sailor
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California isn't any different than anywhere else. (At least in this regard.) Buy your fuel from the place that has the most turnover. That way you know that it hasn't been sitting in the tank forever. Fresher is better.
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