View Poll Results: MPGs in your Ford
25+
0
0%
Voters: 34. You may not vote on this poll
MPG Poll
Cargo Master
Joined: Aug 2007
Posts: 2,558
Likes: 69
From: New Zealand
Well I thought I was getting 16.5mpg, but after checking with a GPS against my speedo found it's 15.8mpg (empty) - F250 2wd, stock 351W & AOD, 3.54, all @ 55mph on 235/85-16's.........never use OD due to combination of speed limit / axle ratio / hills.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
12-16 MPG according to the odometer. The speedo is a bit slow, as the truck originally had 215/75-15 rear tires, and now has 31x10.50-15 on the back. The lower figure is when towing, and the higher is running empty. It did a little better before the taller tires were added.
300, C6, 2.75 rear gears (soon to be replaced with 3.25) and I rarely exceed 65 MPH (under 2,000 RPM).
Of course, trying to get in a hurry can drop the MPG to well into the single digits, but you won't go any faster.......
300, C6, 2.75 rear gears (soon to be replaced with 3.25) and I rarely exceed 65 MPH (under 2,000 RPM).
Of course, trying to get in a hurry can drop the MPG to well into the single digits, but you won't go any faster.......
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
11.5 - 12 mpg running between 60 & 65. 351W with DSII conversion, 2150 carb, AIR & EGR removed, and a Comp Cams 252H installed. Tires are 215/75/R15 at present, but going to 235's soon. Diff is 3.55 and tranny is C6. Running 6 BTDC at present, but will be bumping it up a bit and am considering an adjustable vacuum advance.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Use the narrower slot of the plate up (10-L?) if you have one, or bush the limit pin to keep your centrifugal advance around 20.
Depending on compression and fuel you might have an initial advance of 12* +20 or so centrifugal + the additional vacuum advance, if hooked to the timed vacuum port coming from above the throttle plate.
http://www.cranecams.com/uploads/instructions/271e.pdf
Duraspark_distributor_recurve_instructions_index
Cargo Master
Joined: Oct 2005
Posts: 2,295
Likes: 25
From: NJ
Poll is flawed. Should have wider ranged down low, then tighter as numbers increase. 5-10 MPG is no big deal, most will fall in 10-15, and some higher. As you get into low-mid teens every MPG is a big increase so more significant of a change.
Ina ny event, here's mine...
'86 Supercab F-250, Dana 60 swap up front, 460 swap (around 400 HP), ZF5, 3.55:1, 4" lift, 35" tires, 6000 lbs as it sits. 12.5 MPG highway at 70 MPH and 10 MPG towing about 4500 lbs at 65 MPH.
For extra info, bone stock 351w/C6 no lift, stock tires, 3.55:1 it got ~17 MPG at 75 MPH.
Ina ny event, here's mine...
'86 Supercab F-250, Dana 60 swap up front, 460 swap (around 400 HP), ZF5, 3.55:1, 4" lift, 35" tires, 6000 lbs as it sits. 12.5 MPG highway at 70 MPH and 10 MPG towing about 4500 lbs at 65 MPH.
For extra info, bone stock 351w/C6 no lift, stock tires, 3.55:1 it got ~17 MPG at 75 MPH.
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