Mpg
Postmaster
Joined: Oct 2004
Posts: 4,402
Likes: 1
From: Delisle/Vanscoy, Sk.
I was getting 13 Mph on the highway after my rebuild. Put new carb on it brought it up to 15. Found my problem was the intake had 2 cracks in the body and caused a bad vacuum leak. After finding a replacement from a wreck. I now get 22mph on the highway. That is on long trips. The short trips of commuting suck with todays prices. The motor just gets to good operating temp and you shut it down. So it loses the advantage of mileage. I have more work I want to do on my motor yet.
Postmaster
Joined: May 2004
Posts: 2,854
Likes: 0
66gpw.....yours is an excellent example of what the potential of the 300 is. If owners are getting poor mileage there's a reason. They need to find out what the problem is and correct it. At $3 gas prices it pays to get her runnin good.
Postmaster
Joined: Oct 2004
Posts: 4,402
Likes: 1
From: Delisle/Vanscoy, Sk.
Mine is rebuilt and now has 20,000 km on the rebuild. It is nicely broken in now. I still have a valve to adjust yet that causes a miss. I still got some suspension issues to fix. The front springs are weak causing the front to be lower. That causes more air to be pushed.
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New User
Joined: Mar 2006
Posts: 16
Likes: 0
My '86 F-250 4WD with older non-feedback carb and DS2 ignition conversion got 18 MPG on its long trip down to our summer home. I was happy, seeing it is pretty tired (200-300K+ miles) and it sits up really high.
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Senior User
Joined: Jul 2006
Posts: 302
Likes: 0
I was just given an 1980 f100 ranger with over 320,000 miles on an unrebuilt engine and trainy and it still runs likes it was new(Belonged to a friend of my dads). I got about 21 mpg driving home from Tampa which is about 2 Hrs away doing about 55-60. Nobody can beat an old Ford engine, they just never die.
Senior User
Joined: Apr 2003
Posts: 297
Likes: 0
From: Independence, MO
i get 16.25....just figured it today. All i have done is instill a 302 TB and autolite platinum plugs. 31" tires. Other then that its all stock. Combo of highway and street driving. i run 70-75 on the highway. I'll be takin a long trip in september so i'll get to see what she gets with nothing but highway driving.
Senior User
Joined: Jul 2003
Posts: 311
Likes: 2
From: Nashville
The best I've ever seen out of the van is 15.5 Hwy and empty, not running the A/C. It is after all a 6200 lb brick. Average around town is about 14.5, deduct 1mpg for A/C use [old power sucking York type compressor]. Start towing 4000 lb and it's more like 11-12mpg.
Senior User
Joined: Sep 2002
Posts: 181
Likes: 0
From: Gananoque, Ontario
i get about 14-14.5 average i think, but most of my driving is short distance around 14km to work i think, that and i generaly shift at 2800-3000 rpm i do not use 5th gear on mine
96 F150 XL with dual tanks
300 M5R2
2.73's open diff and 29" tires
empty bed and no tailgate on
only engine mod is cut off stock muffler and stuck on a chery and turn down
96 F150 XL with dual tanks
300 M5R2
2.73's open diff and 29" tires
empty bed and no tailgate on
only engine mod is cut off stock muffler and stuck on a chery and turn down