The 3800 always gets good mileage all highway but terrible city, as is the norm with most American V6 with 4 speed auto.
My Buick Century and 99 Taurus was the same exact way also, I could get at or around 30 mpg on the highway but 15-17 city
My Buick Century and 99 Taurus was the same exact way also, I could get at or around 30 mpg on the highway but 15-17 city