Millage with your 3800

[92LESABRE]

I only get about 19 in the city and on a damn hard lead foot and when im on the higway at 65 cruise set i get about 30 1992 Lesabre Custom with 96,200 miles on good service records and air in the tires

[Smith1000]

I get about exactly the same as elsolo. Have a 97 with 140,000 and another 97 with 126,000. They do about the same.

25 mixed city/highway
28 highway only

I do more highway driving than city in my mixed driving. I have done slightly better than 28 straight highway-at times.

My mileage was down to 22-23 mixed driving and I replaced the plugs and the O2 sensor. I think it was just the cold weather though. Seems like it drops about 2 mpg when it is colder out.

[georgiaboy107]

89 Lesabre, 239,000 miles on it.....28 mpg average. I replaced my air filter with a K&N. I change my oil every 3,000 miles. I only use 89 or higher octane gasoline.