holy crap dude, you can do better than that, I promise.. find your accelerator pump and make sure it is set in the leanest setting, which I think is factory for these motors? Just, do something dude.

Seriously, SERIOUSLY recommend rebuilding your carb even if you think it's 100%, at the very least so you can learn how it all works! Takes an hour or two at worst and costs next to nothing

 

I don't see how you got that 4.39, i don't see when did you factor the gas. You had those 34 miles between your last fill up and today (did you fill up again today? how many gallons did you purchase? Apparently today you filled 7.75 gallons, which is a little less than 1/2 of the tank). You have to divide those miles/#gallons purchased, and that will only work if the tank was left at exactly the same level both times (filling it up completely both times is the most accurate way, since the fuel gauge isn't exact).

Let me do an example: To make things simpler, lets imagine a 30 gallon tank and a 100 mile trip. On the first fill up you had 1/3 (10 Gal) of the tank left, but you decided to fill only 1/3 extra, so you end up with 20 gallons (2/3 of the tank). Then you drive those 100 mi and stop at the next gas station, you spent that 1/3 you filled before so 2/3 - 1/3 = 1/3 (10 Gal), but you decide to fill the tank entirely this time, that would be 2/3 to make the tank full. Now, if you used that last 2/3 we obtained on the last fill up on your calculations, your measurements in this particular case would give you 1/2 of the true mileage you had (wrong: 100/20 = 5MPG, real 100/10 = 10MPG), since from the start you began with -1/3 of the tank. So basically, fill the tank entirely if you wish to calculate your mileage right.

 

You honestly need to go longer distances than that to get accurate MPG. Gas mileage varies greatly the smaller the numbers you're working with.
A less or more sensitive pump than the time before, different temperatures outside, etc. etc. can change how much fuel you can fit into your gas tank. So, if last time, the pump kicked off when you had 31 gallons in the tank, and this time it kicked off when you had 33 gallons in the tank, you may have only used 5 gallons of gas, but it'll look like you used 7.

34 / 7 = 4.8
34 / 5 = 6.8

Can be a bit of a difference.

This is why it's good to calculate your mileage over several fillups (all the inconsistencies blend together), and longer between fillups, to get an accurate idea of what you're getting. A 2 gallon fluctuation makes a lot less impact on 200 miles between fillups than 30 - 35 miles.

Granted, if you really ARE getting 4.4 mpg, you won't be able to go 200 miles on a tank.



IF that's accurate, that's some really terrible, terrible mileage and something's wrong. You're leaking gas somewhere, you're running SUPER rich, your power valve in your carb is blown, something. Unless you're flooring it between every light, you should be able to at least double that.

 

Gas is going up. Cmon 300I6! GET 20 MPGS!!!!!

 

Makes me glad I have a 300. I'm getting 13mpg with cold, short, around town trips to work and back.

 

Mine does ok for EFI but I have a service engine light on

 

I understand what you guys mean, let me first off start by covering my *** here, so i will say that i wasn't driving nice when i did this. I will also say that yes there is really something wrong with the carb, it is out of adjustment and needs to be rebuilt/replaced. Unfortunately it is my only mode of transport so i can't tear into the carb just to find out it will take longer than a weekend to fix. BUT today was my last day at my job so i will have free time i just won't have a large income of money i will have about $50 every 2 weeks from my shelf stocking job until i get another. Also i don't know where the accelerator pump is so i need to check into that. I am pretty darn sure i am getting better than 4.4 MPG but i am also sure the reason i got that was because i was being a lead foot and hammering the gas. I wasn't going easy.

So how i got 4.39 was i took the mileage form the first fill up, i started about half a tank if i remember right. So 16 gallons, (32G tank) then i filled it. This last time i got it filled it had only used maybe a quarter tank BECAUSE if i let it go down to much further then i won't fill it. I can't use that much money. 4.4 is just a rough estimate of what i might be getting and what i could be getting under these circumstances. Anyways so after the second fillup which was 7.740 gallons which cost me $30.18 I then recorded my mileage there. Starting mileage - 25596 take that and subtract it from my next fill up mileage 25630 and i got -34, that is just 34 doing it the other way around. Then i took 34 and divided it by 7.740 and got 4.39, this is how my mother taught me to do it. It may not be accurate to the mark but it gives me an idea that i get pretty well below 10 MPG which is really all i needed to know. I don't need the exact number because it will always change. With all the variations in climate and traffic and all that stuff it won't be worth it to track the exact number.

 

One thing to think about with gas mileage that bad is how quickly it'll start to cost more than paying to fix the problem.

If you can spend $300 on a new carburetor and double your gas mileage, it'll pay itself back really, really quick. Even more so if all you need is a good $35 rebuild kit.

 

In 180,000 miles of driving a 5.0, automatic, 95 Bronco we averaged 12 mpg.

 

You can't drive a Bronco and concern yourself with MPG.... You will always be disappointed.

 

my 95 has 173k on the engine and im getting 15 highway 12 city. i did just buy a chip and it should be here within a week ill let u guys know what happens

 

I'm sorry to break it for you, but you just dumped your money on that chip. From what has been told in here, all those chips do on our trucks is advance the timing, something you can do very easily yourself by disconnecting the SPOUT and using a timing lamp to do the adjustments. It's a procedure that's usually done together with a sixlitre tune up (New cap, rotor, wires, spark-plugs and advancing the timing).

 

Ya i planned on looking into it. For the time being till i get a job i won't be doing much work on the truck.
I agree here, when i started looking for a bronco i made sure that i knew that gas was going to be bad and i was prepared to take that on. I don't regret buying it at all and i know my mileage will get better as i progress on.

 

I'll have a 600 cfm Holley carb possibly for sale once my 870 cfm carb gets here.

 

2 or 4bbl?