Which would get better mileage?
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Senior User
Joined: Dec 2007
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Which would get better mileage?
WHat do you guys think would get better gas mileage in a F2504x4 under same driving conditions, gear ratios, tires, etc...
A 390 or a 400?
And theories to backup your decision??
Thanks
A 390 or a 400?
And theories to backup your decision??
Thanks
Postmaster
Joined: Aug 2000
Posts: 3,312
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From: Eldorado Ca. USA
I would say that if built properly, both will yield about the same economy/power. Because of my serious dislike of the 351M/400, I will say the 390 will have better economy because there is/was a better aftermarket following for it, and more people know what it takes to make em work.
Elder User
Joined: Dec 2007
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From: fallbrook ca.
Originally Posted by masterbeavis
I would say that if built properly, both will yield about the same economy/power. Because of my serious dislike of the 351M/400, I will say the 390 will have better economy because there is/was a better aftermarket following for it, and more people know what it takes to make em work.
Elder User
Joined: Dec 2007
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From: fallbrook ca.
if your diving a 70s 4x4 theres not much you can do about mpg, the best thing you can do is give just enough gas to move it, thats all, and youll be fine.
ive even heard of carbureted 460s gettin 15mpg around town because they keep there foot out of it, results not typical, but its all how you drive.
now you can do things to make your engine run more efficiently with ignition systems manifolds exhaust systems and headers, in combonation with a light foot, and this will get you even better gas mileage.
ive even heard of carbureted 460s gettin 15mpg around town because they keep there foot out of it, results not typical, but its all how you drive.
now you can do things to make your engine run more efficiently with ignition systems manifolds exhaust systems and headers, in combonation with a light foot, and this will get you even better gas mileage.
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From: Colorado
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Post Fiend
Joined: Mar 2005
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From: Louisiana
Neither will be considerably better than the other.....
Taking it easy with some smog equipment removed, I got 15 mpgs out of my 400 on the hwy. That is about as good as it gets. Average would be around 10-12, like the average of a 390.
Taking it easy with some smog equipment removed, I got 15 mpgs out of my 400 on the hwy. That is about as good as it gets. Average would be around 10-12, like the average of a 390.
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