OT: Another 3.8 GM engine question

Posted by Markuss on April 25, 2006 at 09:05:12 from (65.223.237.181):

I have had three (3) GM 3.8 liter engines and they all vary in gas mileage, why?

First off, I drive 120 miles/day - same stretch of road AND I know how to check mileage - over thousands of miles driven.

FIrst car was a 1992 Pontiac Bonneville with with 3.8 engine at 190,000 miles - got 27-28 mpg on highway at 70 mph. (car totalled in accident)

2nd car was a 1999 Pontiac Bonneville with 3.8 engine at 110,000 miles, got 27-29 mpg on highway at 70 mph. (engine and transmission went out, sold car)

3rd car IS a 1992 Buick Lesabre with 3.8 liter engine at 110,000 miles, I am currently getting 23 - 24 mpg on the highway at 70 mph. I have tested this over 6,000 miles and I can only get 23 - 24 mpg????

Why dones the 3rd car get the same mile per gallon? Well maintained, using the same engine oil and driving on the same road?

Thanks!

Replies:

• Re: OT: Another 3.8 GM engine question Jim.UT 12:42:47 04/26/06 (0)
• Re: OT: Another 3.8 GM engine question john_bud 06:01:46 04/26/06 (0)
• Re: OT: Another 3.8 GM engine question RayP(MI) 18:53:43 04/25/06 (1)
  • Re: OT: Another 3.8 GM engine question jc 09:10:53 04/26/06 (0)
• Re: OT: Another 3.8 GM engine question Jon Holt 18:11:40 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question noncompos 12:02:36 04/25/06 (0)
• new plugs, wires and same weight of car Markuss 11:48:55 04/25/06 (1)
  • Re: new plugs, wires and same weight of car dhermesc 14:48:04 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question dhermesc 11:23:07 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question Jimmy King 10:56:50 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question Vern-MI 10:11:01 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question lgc 09:47:07 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question Wild Bill 09:23:22 04/25/06 (0)
• Re: OT: Another 3.8 GM engine question ntmcj 09:11:08 04/25/06 (0)

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