For those who swapped thier 2.8/3.1 for a 3.4, on average what is the miles per gallon you are getting?

 

about 20 city, 28 highway.
SSC

 

Wow, that's awesome. I would love to get 20mpg out of my 2.8L.

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- Mike Harvey -
1986 Firebird S/E

 

So would I, before my 2.8 died it was making like 13-15 city and 20 highway. Well I'm in the middle of the 3.4 swap so I hope to see some nice mileage numbers.

 

Once you get over the joy of the new found power, you'll start to learn to harness it towards your favor.
You can do this with any size engine.
I mean, learn to drive with an egg on the gas pedal, especially, at the trafic lights and after you get up to coasting speed.
I've increased my milage by about 2-4 miles, I'm sure. But with LA traffic, just keeping up, keeping them from cutting in front of ya, dodging bullets (LOL).

In the end, I benefitted so much more, than just increased gas milage, my swap was so totally worth it!
I mean, I have impressed the editor of Car Craft magazine with this swap project !

I can say that highway milage is way up there, now, tho.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

[This message has been edited by KED85 (edited May 28, 2001).]

 

I've heard that a vacum leak can cause low gas milage. Why would that cause low gas milage? And if you do have a vacum leak thats causing low MPG, where would you start to look and how would you fix it? Thanks!

 

Last week I got 22.5 mpg from my 305. Then again it was premium gasoline. I even drove like a madman. I love dusting cars that seem to follow me. Its so fun. I did it today to a Geo, my god it was crazy.

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1992 Pontiac Firebird (stock)
- 5.0L V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!