can a 85 f-250 w/351w. get 15mpg or better?

Answer 1

Yes, it can. I have an 86 F-150 4X4 with the 351W and I get 16-18 MPG on the highway at 75 MPH. Here are specs for comparison
351W bored .030 over, BIG Comp Cams Xtreme 4X4 Camshaft, Heads from 1969 351W that have been ported/polished/gasket matched, absolutely NO Emissions equipment (my emissions readings are better than the wifes 97 Accord with full emissions crap) an Edelbrock Performer intake with Edelbrock 600 CFM 4BBL. Long tube headers, True dual exhaust with straight pipes. Transmission is a C6 that means NO Overdrive rearend is a Dana 60 from an 83 F-350 with 4.10 gears. Tires are a 35X12.50 and everyone reading this is saying I'm full of ****----BUT I'm not. You see the trick to fuel mileage is to take into consideration the OVERALL drivetrain not just the engine. The 4.10 gears and 35" tires put the final drive gearing back to OEM specs of the 3.55 gears and 30" tires (P235/75R15's) There is no OD BUT the engine was built and designed to perform better at slightly higher RPMS, this means the engine is naturally making a buttload more power and does not have to work anywhere near as hard which uses ALOT less fuel. I will admit my around town mileage is pretty pitiful falling into the single digit range at times (8-12) BUT thats due to the engine being out of the powerband and acceleration/stopping. Figure out where you are going to do the majority of your driving and what you are looking for and then build to meet those specs and you will be happy with your final result.

Answer 2

This depends on how well the vehicle is taken care of and has been taken care of. If you do your oil changes every 3 months or 3K miles, and you change your spark plugs wheny our owner's manual sugests to, and other preventitive maintinance, sure, it will get that easy.

If you drive it into the ground, never change the oil, filter, or plugs, never have it tuned up, go leadfooting around all over, nope, you;ll kill any vehicle like that. Take it easy, take good care of her, and she'll get better than 15 mpg easy.

Answer 3

sure can. I own a 1985 Chevy high top conversion van and I am getting it to get me 19mpg highway with a tail wind.

First I put on a 60.000 volt coil. second I used 8.8mm plug wires and copper plugs one heat range hotter. I slightly advanced my timing and put on a brass tipped distributor cap. I gaped the plugs an extra .05. I put in a air hog air cleaner, Then If you need to go further then put taller tires on it. If you have dualys change them to single 3/4 ton wheels. I also removed the air conditioning belt and removed the smog pump belt and removed the vacuum from the EGR Valve. And last but not least... keep your foot out of the gas peddle.

Answer 4

Don't forget to put on some headers and dual exhaust!
Most importantly, try to keep highway speed to less than 65 MPH for the best effeciency and take your foot off the gas going down a hill.

Answer 5

step one.. get an overdrive transmission or overdrive unit if you don't have one already for the truck

Step two.. change the rear end... if it was a stump puller, it's probably got some 4.10s in there... need to find out and go with some taller gears like 3.55:1 or taller. Little less tow power but it's either pull power or fuel economy power on something that old.

Make sure it's tuned up properly and the exhaust and stuff is up to snuff.

Answer 6

Un plug the egr valve? A EGR exaust gas recirculation valve introduces inert, allready burnt fuel and air. back into the intake displacing the need for more gas and air. only during cruise or steady state driving. And light accel. It reduces combustion chamber temps and reduces spark knock. and because it operates from engine vacume. It dosn't open on hard accel or heavy load. Because their is no engine vacume to open it! What I am trying to say is egr valves save fuel by reducing the need for it. without it you would have to retard the ingnition timing to elimnate pinging. reducing power. and fuel economy. And it also reduces NOX oxcides of nitrogen global warming acid rain kind of stuff,

Answer 7

That would depend on a lot of things. Mainly how heavy of a foot you have. But other factors include how many miles are on the car, what kind of shape the engine is in, etc.

Answer 8

i admire clean white corn the main suitable. while it rather is available in early spring summer season this is the main suitable vegetable. merely cook dinner it a splash and butter and consume. Or for something a splash distinctive i like to shrink the corn of the cob and saute it with peppers and onions. Thats fantastic as nicely. i admire carrots yet dont consume them that in many circumstances as they puzzling for me to swallow. never been a great fan of cauliflower.

Answer 9

That engine and year model will burn a lot of fuel. Only way is to change rear axle ratio