[AElayyat]

Hey guys I am really considering a 90 - 92 Brougham. I have liked these cars for a long time, but my only concern would be the gas milage. I do more city driving to and from work. So the question is what kind of gas milage do you guys get? Do these cars require regular gas or premium?? And is there a noticable power difference between the 5.0 and 5.7??? Thanks in advance.

 

[90Brougham350]

The powe difference between the 307/305 and the 350 is significant, a 4-second difference in the 0-60 times alone. I can usually average right around 21 mpg highway with my 90. My city varies, sometimes it's around 12, other times it's closer to 13.5, maybe even 14. It's all dependant on your driving habits. Total average, around 17. You don't need to run premo but you can advance the timing a little more if you do. You don't need it though.

 

[caddieboy]

http://www.fueleconomy.gov/

The real value of the site is putting in custom numbers for fuel cost and changing the hwy/city ratio to find out the difference in annual cost for gas. Doing this made me realize you not saving shitloads of money driving a caddie tank over something a bit more fuel efficient.

Also, the differences in fuel economy for the different years 90/91/92 are apparently due to the way fuel economy was calculated. They should otherwise have the same fuel economy.

 

[N0DIH]

...

Also, the differences in fuel economy for the different years 90/91/92 are apparently due to the way fuel economy was calculated. They should otherwise have the same fuel economy.

But everyone keeps saying that we calculate MPG based on 1975 methods. NOT. Caddieboy is right, it has varied over the years.

I would like to know the differences over the years.

 

[caddieboy]

But everyone keeps saying that we calculate MPG based on 1975 methods. NOT. Caddieboy is right, it has varied over the years.

I would like to know the differences over the years.

Interesting discussion in a post I made a short while back.

http://www.cadillacforums.com/forums/showthread.php?t=50403

 

[brougham]

Mine gets around 15mpg. I just use regular and that's what it says to use anyway. Id only ever get a 5.7L one but if you don't care about performance it doesn't matter which. The bigger engine gets worse gas milage and I think I read somewhere before that 5.7L Broughams and Alantes are the only cars for those years that are listed as gas guzzlers.

 

[caddieboy]

Mine gets around 15mpg. I just use regular and that's what it says to use anyway. Id only ever get a 5.7L one but if you don't care about performance it doesn't matter which. The bigger engine gets worse gas milage and I think I read somewhere before that 5.7L Broughams and Alantes are the only cars for those years that are listed as gas guzzlers.

The difference on the highway isn't huge, and even the difference in the city isn't THAt big. Use the fueleconomy.gov site. I think there was a difference of $100 per year if driving 12,000 miles. Change the parameters and there's has high mileage per year. 25,000 per year is the default I believe.