View Poll Results: what fuel economy do you get from your 3800II engine ?
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3800 series II fuel economy
Junior Member
Joined: Feb 2007
Posts: 21
From: United States
I also have a 99 regal, but it only averages 25 in the highway!
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Super Moderator
Joined: Jul 2006
Posts: 442
From: United States
Originally Posted by MrBSS
I have a '97 Ultra (Supercharged). It is my second; first purchased new and sold at ~260,000 miles. I still see it driving around the neighborhood.
I think you will like the SC engine. You can get very good economy if you drive nice, and still have a car that is very fast when you want it to be.
One small downside is that you are supposed to use 91 octane fuel. However, I don't believe you will do any damage using regular because the engine computer will retard the timing at incipient knock. Particularly during winter, I often use regular and have seen no problems.
PS: Keep in mind that the Park Avenue is a larger car, and even with the same engine, is not likely to achieve the same mileage.
but on the regular gas, thats just wrong. you should ALWAYS run premium on the L67s. with the L27s and the L36s, regular is fine and premium is just unnecessary.
and yes, the pcm will detect kock, and retatd the timing, but it cant do that untill AFTER the knock occurs. thats badEdited by: samueljackson
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