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Poor Gas milage

 
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ELI
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Joined: 20 Feb 2012
Posts: 33

PostPosted: Sun Feb 26, 2012 6:00 am    Post subject: Poor Gas milage Reply with quote

1970 Bronco, stock 302 2bbl, I am getting 9.4 mpg...uhg! Smells like she is burning rich...$5 gal. gas...not good! Any help or ideas, or know how to adj. fuel mixture would be greatly appreciated, or any other ideas.
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maui
BFix Built
BFix Built


Joined: 22 Jul 2010
Posts: 284
Location: Happy Valley, Oregon

PostPosted: Sun Feb 26, 2012 10:05 am    Post subject: Reply with quote

Convert to EFI. My mileage went up a lot. I don't have numbers but I definitely spend less time at the gas station.
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Scodge
BFix Locked and Loaded
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Joined: 30 Mar 2005
Posts: 1159
Location: Santa Barbara

PostPosted: Sun Feb 26, 2012 11:14 am    Post subject: Reply with quote

Buy a 1995 Honda civic for daily driving. You hear guys talk about 20 mpg in EB's, but I think those are fish stories. I've got a pretty mild rig, 33's, 4.11 gears and a 5.0 efi motor. I'm getting about 12 mpg with a tailwind. A truck with a carb is lucky to do better then 10 mpg. Tune your rig up, check your tire pressure, and install a vacuum gauge. The more vacuum your engine is pulling during driving, the better your fuel efficiency. Back in the '80's, BMW put fuel efficiency gauges in their cars. They were really just vacuum gauges.
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Scott
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[0===0] '67 ragtop, 5.0 EFI, PS, PDB, D44 front axle, faded blue paint and rusty floorboards.
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ahansen_1985
Bfix Carb'd
Bfix Carb'd


Joined: 05 Aug 2008
Posts: 83
Location: amity Oregon

PostPosted: Mon Apr 02, 2012 6:33 pm    Post subject: Reply with quote

Eli I might be able to help, where you from?
Also it is possible to see a bronco into the high teens.... It's hard to do, but it's possible:) I average 17 with mine...
But my setup doesn't work for everyone....

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66,351w,m5od,205, full width hp44,9...5.5, 37's
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ELI
BFix Starter
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Joined: 20 Feb 2012
Posts: 33

PostPosted: Tue Apr 03, 2012 10:10 am    Post subject: Reply with quote

I live in SW Virginia, 1,100 ft. above sea level.
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ahansen_1985
Bfix Carb'd
Bfix Carb'd


Joined: 05 Aug 2008
Posts: 83
Location: amity Oregon

PostPosted: Tue Apr 03, 2012 11:25 am    Post subject: Reply with quote

Well with that kinda distance best advice I can give you is that for milage you have to find a happy medium for
Your motor...
If you over gear it will bog to much
If you under gear it will be wound tight...

My setup prob won't work with your due to your 302, but you might be able to play with it...

351w, edelbrock carb, wieand aluminum intake, electric fan, headers, dual exhaust, electronic aftermarket ignition,
I'm running a m5od 5 speed, which gives me a overdrive, np205 tcase, and 3.50 gears with 35/12.5/15 mud terrains..

When I ran my 3 speed I averaged 15-17 depending on my driving,
With my 5 speed I'm averaging 17 more consistently....

I have just enough power in 5th to
Pull a small trailer without bogging, but if I want to pass someone drop er down to
4th, or even 3rd depending on speeds...

My bronco weighs 4200 lbs, with hard top and full size axles, but the whole front clip is not factory either

It's all finding what works best for you...

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rbarchi
Bfix Carb'd
Bfix Carb'd


Joined: 15 May 2011
Posts: 99

PostPosted: Tue Apr 03, 2012 1:52 pm    Post subject: Reply with quote

is your exhaust pipes black inside? I would tune it up to start if you are smelling it is running rich.
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'73 Banana Bronco Sport, 3" lift, 302/4BBl/MSD/C4/PS/PB/front disc, lots of hidden rust
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DirtDonk
BFix Locked and Loaded
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Joined: 27 Jul 2003
Posts: 2635
Location: San Jose, CA

PostPosted: Thu Apr 05, 2012 9:49 pm    Post subject: Reply with quote

Depends also where you're getting that mileage. When mine was a daily-driver (as opposed to a driveway queen) it consistently got between 9 and 11 with a mixed city street/expressway trip. Didn't seem to matter if I stayed cruising or stopped at lights for awhile. Same mileage.

Depending on accessories, on the freeway I consistently got between 14 and 17 mpg. The only time I could get above the magic 15.5 mpg barrier, was when I had a little Holley 450 cfm "Economaster" smog carb on it. Otherwise it got 15 and that was it.

And this was in a very modestly modified EB with a constantly tuned up engine. I'm a tinkerer by nature, so I rarely got more than a few thousand miles on it before I was twiddling with the carb, the distributor, air pressures and anything else that could be adjusted.
The mileage never varied whether it was stock original, or had electronic ignition added, swapped brands/styles of spark plugs, ignition control boxes, or any one of various 4bbl carbs mounted with various jetting experimented with.

So if your 9.5 is with mixed driving, or over hill-and-dale, that's not all that out of the ordinary.
Hope you can meke it better though.
Good luck.

Paul
It "ran" better each time I made a change, but never got better mileage.

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'71 Bronco - 302 4v
3.5" WH/Skyjacker Lift
33 x 11.50 x15 Thornbirds on 15x7 Enkei's
Kayline soft top
Hanson bumpers
Dual batteries, Large 1G alt.

WWW.WILDHORSES4X4.COM Mr. Green
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Stan
BFix Locked and Loaded
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Joined: 29 Jun 2004
Posts: 3471
Location: Boring Or

PostPosted: Fri Apr 06, 2012 7:08 am    Post subject: Reply with quote

Ya - what they said . Also What gears and what size tires ? Do you have a manual choke on the carb?
I find it difficult to check the gas mileage on these things - especially in daily stop and go and here and there driving. I've been able to do it a couple of times on " longer road type trips " where i knew the miles traveled and the amount of fuel used - two key components in the MPG equation. Wink Smile - Don't trust your odometer or the gas jockey filling your tank.
Stan

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Homer - " Facts are meaningless . You could use facts to prove anything that's even remotely true."
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ahansen_1985
Bfix Carb'd
Bfix Carb'd


Joined: 05 Aug 2008
Posts: 83
Location: amity Oregon

PostPosted: Fri Apr 06, 2012 7:18 am    Post subject: Reply with quote

Stan did bring up a great point, milage is only accurate if the fuel is refilled to the same spot... I take mine till I can see the gas sitting in the fuel neck.... And I keep track of my milage via gps when I have checked it....
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Stock 68
BFix Locked and Loaded
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Joined: 22 Aug 2007
Posts: 562
Location: Allupinya

PostPosted: Fri Apr 06, 2012 5:14 pm    Post subject: Reply with quote

Stan wrote:
Don't trust your odometer or the gas jockey filling your tank.
Stan


Don't you mean "don't trust your odometer if you've modified your Bronco all to hell"?

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Y'all are a buncha modifiers
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SHAWN
BFix Locked and Loaded
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Joined: 13 Nov 2005
Posts: 1615
Location: Sandy, OR

PostPosted: Fri Apr 06, 2012 5:37 pm    Post subject: Reply with quote

My odometer is right on...and mine is just a little modified.
When I still had both tanks, I use to put ten gallons in the rear and run it empty. That way there was no room for error.

Shawn.
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Stan
BFix Locked and Loaded
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Joined: 29 Jun 2004
Posts: 3471
Location: Boring Or

PostPosted: Sat Apr 07, 2012 6:24 am    Post subject: Reply with quote

Don't you mean "don't trust your odometer if you've modified your Bronco all to hell"?[/quote]
I wouldn't be assuming that your stock odometer is correct when figuring your mileage - i'd certainly test /check it out first . I wouldn't be surprised to find some of them off - say 10% -- that 20 gals of gas it took to drive 300 miles = 15 mpg . But if it was only 270 miles ; that's 13.5 mpg . You could ne lucky and have it off the other way; then that's 20 gals. for 330 miles and that's 16.5 mpg. Smile
Stan
I use Shawns' method when i check mine

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When you come to a fork in the road - take it
Homer - " Facts are meaningless . You could use facts to prove anything that's even remotely true."
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Scodge
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Joined: 30 Mar 2005
Posts: 1159
Location: Santa Barbara

PostPosted: Sat Apr 07, 2012 8:08 am    Post subject: Reply with quote

Are there still gas jockey's anywhere?
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Scott
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[0===0] '67 ragtop, 5.0 EFI, PS, PDB, D44 front axle, faded blue paint and rusty floorboards.
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SHAWN
BFix Locked and Loaded
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Joined: 13 Nov 2005
Posts: 1615
Location: Sandy, OR

PostPosted: Sat Apr 07, 2012 8:27 am    Post subject: Reply with quote

Scodge wrote:
Are there still gas jockey's anywhere?


It is 'illegal' for you to pump your own fuel unless you have a motorcycle in Oregon.
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DirtDonk
BFix Locked and Loaded
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Joined: 27 Jul 2003
Posts: 2635
Location: San Jose, CA

PostPosted: Sun Apr 22, 2012 8:12 pm    Post subject: Reply with quote

Mine was spot on as well (after I fixed it) and I always ran my tanks to empty then filled up with a known number of gallons.
So my calculations were as accurate as I could make them.

Paul

_________________
'71 Bronco - 302 4v
3.5" WH/Skyjacker Lift
33 x 11.50 x15 Thornbirds on 15x7 Enkei's
Kayline soft top
Hanson bumpers
Dual batteries, Large 1G alt.

WWW.WILDHORSES4X4.COM Mr. Green
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