Is CA diesel dilluted like CA gasoline. - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 03-07-2009, 08:29 PM Thread Starter
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Is CA diesel dilluted like CA gasoline.

Fact that there is not much gasoline sold at gasoline pump in California is known for years. Few years ago I could access a site that would show what we fill our tanks with, what was about 7% of alcohol at the time, but the site no longer exist.
Few times when I filled up my gassers in AZ or other states (NV sells CA refined gasoline, so it doesn't count) my mileage skyrocketed. My estimate is that CA gas gives 15% less miles than other gas.
That was one of main reasons why I switched to diesel sedans beside diesel motorhome and diesel pickup.
Coming to the point, the newest W211 with diesel engine has on board computer that display mpg while you drive. On flat lands in Nebraska, where I had cruise control set at 81 mph I was averaging 49 mpg on 50 miles stretch. That with heavy load and AC at full blast.
The mileage in CA was much poorer, more around 32 mpg, but I was blaming that for freeway blockers, who make you constantly slowing down and accelerate and lot of grades as well.
But lately thanks to economy I was able to drive 40 miles on CC and had only disengage it 2 or 3 times. The trip was on one of the flattest 680 freeway and CC set at 70 mph. So with empty car and no AC the best I was getting was 39 mpg.
My believe is, that slower cruising speed should well compensate for driving on same grades, but still can't understand the much lower mpg on CA diesel.
What are the others experience whenever you have a chance to compare?
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post #2 of 2 (permalink) Old 03-08-2009, 01:33 AM
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When I was driving a diesel I noticed a big difference. My range would go from 300 miles to 500 miles by purchasing fuel from Beacon and a few smaller stations(they were likely supplied by Beacon or one of the smaller refineries). If I filled up at a major brand station like Unocal it never varied much from the 300 mile range. It was all CA refined fuel.

I had similar experiences with gasoline. I would typically get an extra 5mpg with Texaco gasoline. This was when Texaco refined and sold their own product around here. Again this was all CA refined.

It seems like they all sell the same formulation fuel now.
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