Hey, I'm still getting used to my new 2005 Monte Carlo SS. I love the car, but it seems like it's getting pretty bad MPG lol Do you guys generally put in 91 premium gas? (That's what I'm using atm) It just feels like it's eating it up with the quickness no matter how I drive.

I've cleaned the MAF checked the spark plugs, changed the airfilter to an after market one and the MPG still seem bad. It feels like I'm back in my 1997 ford thunderbird v8. Must be the supercharger, but online it says ETA 19 City 27 Highway ...

Fuel pressure regulator looks good also.

 

I get 28hwy sence i got no cat but i used to get 32-33 you should get atleast 28 with yours

 

I'm getting 19-21 mpg in the city/country with my 05 SS. Don't do any highway driving. I do have some mods that help with air flow though. Is 91 Oct the highest in your area? I would put at least 92 in. My car has 90,500 miles on it BTW.

 

Wow, you guys are getting pretty great MPG I'll have to keep looking into this. I think some stations has 92, but that would be the highest. I doubt my fuel filter is bad, but that will be the next thing I check...

 

When I got the car they filled it up with like 87 octane watered down gasoline and it felt like I was hurting my Monte... :/

 

I usually get about 18 in the city and avarege 23 or so on the highway. I have hit about 32 with really good conditions and a long flat road.

 

shouldn't run 87 octane in it... run at least 91...


I get 20.5 in mine, with 50/50 town/highway driving... Mobil 93 octane... Mobil-1 5w-30... 5.3L engine... 330hp, 350 tq....

 

Scroll through this topic, lots of mpg reports from various gen monte owners.

https://montecarloforum.com/forum/ge...our-mpg-31845/

 

When I had my supercharged 04 I averaged a hair over 30 on the highway, around 20 or so with just city driving. My current N/A Monte SS got 32 going through the mountains on my way to Mom's for Thanskgiving and back. I still only get a hair over 20 so it's not a huge gain for a loss of 40 hp and 55 tq. I never did mod my 04 and haven't modded the 01 yet either. Haven't even done exhaust yet.

 

If I behave I can get 26 or so out of the Deuce's 5.3L

Normally I get around 23