Re: OT: Another 3.8 GM engine question

Posted by Jim.UT on April 26, 2006 at 12:42:47 from (64.122.18.247):

In Reply to: OT: Another 3.8 GM engine question posted by Markuss on April 25, 2006 at 09:05:12:

I used to get 27 mpg in my '93 Olds Eighty-Eight. Now it's down to 19-21. I've had it "tuned up" etc by professional mechanics that have never let me down in the past and I still get in the lower 20's.

I think I'll talk to my mechanic friends about the MAF, O2, and TPS as John_Bud suggests.

I also have a '92 Buick Regal with the same engine (smaller car) but I don't really know what mileage I'm getting because the odo is inop. Based on my daily commute and the fact I need to refuel about every 10 days, I figure I'm getting in the mid to high 20's.

One thing I notice about the larger GM cars with 3.8 (Bonneville, Eighty-Eight, LeSabre) is that on any kind of downward slope the vehicle will pick up speed. On a level flat area you can take your foot off the gas and the deceleration rate is much slower than other vehicles. That's not the case with the Regal. I assume it's due to transmission and final drive ratios.

I also had a '94 Bonneville SSEi (supercharged) that did not "coast" as well as the Olds and it only got about 24 mpg, but that was because it was so much fun to hit the go pedal!

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