1991 Cadillac Brougham with the 5.7 (350) LO5 V-8
Has hit for as high as 27.2 MPG on the highway with A/C compressor off. Driven under worst possible conditions, which means A/C compressor on and engine cold, 11 MPG in town.
Comparable cars: Chevrolet Caprice, Buick Roadmaster, Olds Custom Cruiser (station wagon).
Engines found in these body styles: 5.0 Olds, 5.0 Chev, 5.7 Chev LO5, 5.7 Chev LT1
The LT1 has the highest rated HP and will do 140 in a 1994-96 Fleetwood but you need to take off the fender skirts if you go 120 MPH or higher...LOL!
The 5.0 Olds is the least satisfactory engine of the bunch but there was a ton of them made in the 80's, so finding parts is not a problem. The 5.0 Chev had a short production run in the Broughams (91-92) and it's almost as good as the 5.7 LO5. The 5.7 LO5 is a decent engine for durability and was used through 1993 in GM full-sized cars, with that engine being supplanted by the 5.7 LT1 in 1994.
The LT1 is the engine that powers the Impala SS's from the 1990's.
For a car that weighs in a bit over 2 tons, they get fine MPG on the highway and they burn regular unleaded as well. When GM downsized their big cars starting with the 1977 models, the big engines were the 425 (Cadillac) and 403 (Olds, Buick, Pontiac) and they were hooked into a 3-speed automatic (TH400/TH350). By the time we get to the last of the breed in the 1990's, the combination of mid-sized V-8's, automatic overdrive transmissions, fuel injection and computer drivetrain management made for a car that got in the high 20's for MPG. The reliability of these cars is high. One thing Detroit knows how to make well is large cars, trucks and vans.
Rick
