What is the mpg rating of a stock 1968 pontiac firebird 400 motor?

Posted by admin in Monday, December 8th 2008   
Topics: Uncategorized    Tags: , ,
mpg
Chris H asked:


I wanted to know so i would know what all i could do to my car without dipping to low in the mpg range, thank you.

thats sick
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2 Comments

Willis C said in December 20th, 2008 at 4:32 am    

In real world traffie you’re looking at 6-9mpg (depending on how often u open the 4 BBL & maybee 10 on the highway depending on if you use high gears a 2.73,2.56 or 2.41. I doubt you’re car would’ve had 2.28 gears. If you convert to a 200R4 trans (performance modified) you can have a 4th gear OD. That would give you milage of 12-15MPG. I doubt a big block would get over 15mpg even witha 4 speed tranny.

inagaddadavida_loca said in December 22nd, 2008 at 6:36 pm    

I don’t think this engine needs to be as bad as some are purporting.

Assuming it’s the stock 330hp 400 with 3.23 gears and tuned right, it probably gets up to 14 on average with combined driving. Get 2.73 gears and you’ll see that climb to 16-17 if your right foot is gentle. A car like a true Ram Air car would be hard-pressed to get more than 12 mpg on the highway due to higher-performance cam and 3.90 or 4.33 gearing – sub-10 mpg would be considered normal around town.

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