my '88 = 9-10 mpg

 

Stock drive-train 'cept for the 35" tires (including odometer measurement) - about 8 - 9. The sixlitre upgrade bumped it up from 7.

 

sixlitre upgrade??

 

An apprentice buddy of mine just did it to another friend's 5.0 litre Stang and we're dyin' for him to get the insurance on for the Summer so's he can assess the improvements.

This guy's got 4.11 gears, a worked AOD and an open 2 1/2" X-pipe with aftermarket headers.....we're expecting big things from it.

Sixlitre

p.s./
we skipped 13.5 and went straight to 15 degrees

 

Nevermind, I did a search and found it

http://www.fullsizebronco.com/forum/showthread.php?t=63592&highlight=sixlitre+upgrade

 

I get 10-11 highway and 9-10 around town. 351W built with Edelbrock everything, 4.88's and 37's.

 

Before I finished my accel ignition upgrade I was gettin about 10.25mpg and after I put my new accel 4000 superstock wires, race coil, autolite double platnum plugs I am gettin about 11.5mpg, Im still waiting on the accel cap and rotor and need to get a new coil wire so that'll help some more.

 

93 5.8 w/33x12 BFG M/Ts

Got 16 when new (after break-in of course)

It gets around 12-14 now.

Mostly depends on your driving style...

 

In an 89 2wd F-150, I got around 8 mpg doing all around driving (some highway, mostly in town). That was before I got a tuneup. Now it seems to be doing better, but I haven't tried to calculate it recently. Now if I could just keep my foot off of the pedal, I don't call it Trigger for nuthin:toothless .

 

I get 10-11 in my '90 4 door Bronco, bone stock with 3.55 then, now 4.10 and 235/85/16's.(32" tall). I average 6.5 MPG towing 7-8K.

 

Wow, I guess mine is better then I thought.

89, c6, 33's, and 3.55's and I get a little under 12. I was getting 7 before I replaced my wires, cap, and rotor.

 

I have a 96. City I get 10-11.5, Highway I get 13-14.5. Oh yeah, I got 4.56 gears and 36" tires, and six's upgrade.

 

12 to 13.....

 

you can get away with more initial timing on lighter vehicles

 

i get 16-18 highway and 14-15 city on my 94 5.8 sitting on 33x10.5 tires

 

Best my old 351w HO ever got was 15mpg prettymuch all interstate driving. Thats with a c6 and 3.50 gears, 31" tires.

After beating for a year or so, i was getting about 7mpg....

Put on a new intake and carb, the sixlitre ignition upgrade, and some 32's and was gettin about 11-12 until i parked it.

That was on a CARBED motor too...

 

my carb'd 351w got 10-12 around town with 4.11 gears, 35" bfg's, ford racing 9mm wires, gapped plugs, accel high vibration coil, new edelbrock 1400 carb, edelbrock performer intake, and mac mustang shorties :toothless

 

Ok anyone here work for or did work for Ford, that KNOWS what our broncs SHOULD be getting. Like what the window sticker stated when new?

 

11.5 AVG

 

Back in 1992 I had a stock 86 with the 5.0, and one time I got almost 22mpg on a long highway trip.:shocked almost had a heart attack.

 

I'm averaging around 17mpg right now, combined ~40% city and ~60% highway driving. That ain't driving like a granny, either.

 

Sooooo, what are the best things to do to increase fuel mileage besides the full tuneup. I have already done all the fluids, plugs, wires, cap, rotor.

I bought a can of seafoam, waiting for the next oil change to put it in.

My next step is putting on exhaust and then doing a partial sixlitre upgrade (Just doing the ignition coil and cap and rotor)

 

Do da ignition upgrade while you wait for exhaust funds to gather. You could be saving the gas money towards the exhaust.

Take you an hour or two one Saturday afternoon and may change your Bronco's life !

HD78

Must be somethin' bout them 86 heads that gives us the edge mileage wise. I wish I'd bought a shortbox fleet side F-150, with the 5.0 litre in 86 ! (did they have the 5 speed manual back then ?)

It'd be like having your cake and eating it too !

Sixlitre

 

12 MPG

 

Mine was getting 13 hwy, 10 city before I sold it.