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Old 11-01-2007, 11:49 AM   #15
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Tom - I have a '94 sub 2500 with the TBI 454. In addition to Andy's wind speed/alt suggestions (which are pretty well thought out) there are several things you can do. I am actually in the process of doing several of these right now and the mileage change as a % is improving. I do realize that my motor is a TBI and yours in a Vortec - but this is what I've done. I replaced the intake manifold with a part from a Canadian hot rod shop and this gives me 2 insulated cold air tubes about 5 inces in diameter coming in. I'm getting ready to install a digital version of an MSD 6AL box from Summitt, new coil, new O2 sensor, fresh plugs and fresh wires. Finally, I'm going to get a true free flowing exhaust from the cat back on. My starting mileage was avg 11.5 MPG - interestingly it is not much effected when towing a racecar on an open trailer at 70MPH. With the intake alone I'm looking at about 13.7 MPG. Also - I forgot to mention I use a K&N and don't laugh but I use a Tornado. I swear it makes a difference. With these motors there is no holy grail solution, but there are a series of small adjustments and mods that will accrue 3-5 MPG. That said, it is a 7.4L motor with 385 lbs/torque - the story will only get so good without forced induction and custom ECU mapping.
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Old 11-01-2007, 11:52 AM   #16
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Quote:
Originally Posted by Chuck
well, duh, that IS the altimeter setting...and its what I don't have.
Since when do sectionals give you the current barometric pressure?

I know, I know...just find the nearest airport on the chart, and set it that way...very "rough", though.

Either that, or Andy only camps at airports.

I only camp at HHV.

It's elevation is only 12 feet, more or less.

Andy
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Old 11-01-2007, 11:55 AM   #17
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We have a .060 over 455 engine in the Pontiac and when I was towing we got noticeably better mileage than we do now that Donna is towing . We have very different driving styles and even with "all my coaching" it would appear that the fuel mileage is going to be less for the foreseeable future.

A couple of things I'd done to improve mileage:
  • Slowed down. By sticking to 55 instead of 65 my mileage was noticeably better
  • The Holley 650 is a good carb but on a very strong suggestion by one of my car club peers I swapped to a 600 Edelbrock. That $250 investment (a group purchase by the car club of 8 of them got us a super deal) added close to 2 mpg, it idled nicer, and cold starts are easier. It also comes out much cleaner when it has it's annual emissions test
  • I'm hoping to move to an aftermarket FI system - a car club friend put Holley's Pro-jection system on his hotrod and he gets 4 mpg more than he was getting before that.
  • I have 2 1/2" exhaust, no headers
  • On my '72 Corvette with 454/auto I swapped out a new Quadrajet for a 780 Holley and although it ran cleaner emissions wise, fuel consumption went up noticeably. I swapped back to the Quadrajet. The fellow who bought the car from me wanted the Holley really badly so we did the swap and now he's back asking to buy the Quad.
But the biggest improvement is in driving habits and keeping the speed down.

Now, if I can just get the love of my life to drive "exactly like I do" we'll have much quieter trips, and the fuel mileage will go back up. Oh sure, I may be bruised and tied and the mouth taped up, but we'll be saving gas .

Barry
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Old 11-01-2007, 12:00 PM   #18
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Quote:
Originally Posted by Chuck
well, duh, that IS the altimeter setting...and its what I don't have.
Since when do sectionals give you the current barometric pressure?

I know, I know...just find the nearest airport on the chart, and set it that way...very "rough", though.

Either that, or Andy only camps at airports.

Sectionals don't give barometric pressure, but they do give airport elevations.

Altimeters have a knob that you turn to adjust to the local barometric pressure, or, the airport elevation. If you adjust to the airport elevation, that automatically gives you the barometric pressure in the little window that's a part of all altimeters.

In flight, you adjust the altimeter barometric pressure as reported by the local Omni station, which corrects your altitude as you travel. That keeps you at the correct altitude when your flying an aircraft.

Andy
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Old 11-01-2007, 01:12 PM   #19
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Quote:
Originally Posted by Chuck
and um...how do you get an alitmeter setting before departure...from a campground?

My GPS give me altitude...
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Old 11-01-2007, 02:50 PM   #20
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Have you looked into aftermarket programmers/displays? I've seen several that display instantious , instantouins , heck, REAL TIME MPG. That's one way of telling you to get your foot off the floor. My Jag has the feature and it really points out where I was killing my mpg
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Old 11-01-2007, 03:24 PM   #21
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Quote:
Originally Posted by Inland RV Center, In
Sectionals don't give barometric pressure, but they do give airport elevations.

Altimeters have a knob that you turn to adjust to the local barometric pressure, or, the airport elevation. If you adjust to the airport elevation, that automatically gives you the barometric pressure in the little window that's a part of all altimeters.

In flight, you adjust the altimeter barometric pressure as reported by the local Omni station, which corrects your altitude as you travel. That keeps you at the correct altitude when your flying an aircraft.

Andy
yes, I know that...as do half the others here, who are also pilots. (its all part of the alluminitus ).

just fun-in' with ya. That's what I meant when I said "Andy must only camp at airports". and sure, while operating an airplane, you can get updates from various vhf sources. but what about when operating an airstream? Did you have a vhf radio installed, too, so you could pick up the local atis as you past by on the highway?
Bob's got the answer: gps. great! but more expensive than your altimeter idea. Oh, well. we're all airstream-millionaires, here, right? what the heck -- might as well go for the full panel. Lets see, I've got airspeed, altimeter, vhf, gps, CB, cell-phone, on-star, am/fm/cassette...and lets not forget Ipod...tranny temp guage, tach, manifold pressure, truck came with its own tach and oil temp, I already carry a compass (for checking my electric brakes), someone mentioned a vsi...nah, too much lag. Oh, yeah, I can use the parking/level guage mounted under the front window of the trailer as a turn and bank...
Holy crap!! It IS as complicated as flying an airplane. and expensive, too! no wonder, I haven't got any $$$.

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Old 11-01-2007, 04:09 PM   #22
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Quote:
Originally Posted by Chuck
... It IS as complicated as flying an airplane...
I want to see you do a zero bubble 360 at cruising speed....
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Old 11-01-2007, 04:24 PM   #23
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Quote:
Originally Posted by tlavergne
I have a 1999 Chevy Suburban with a 454 engine. The truck is great. I really don't want to buy another truck but the gas milage is killing me. I would like to explore ways of improved MPG's. The first thing I think of is a full flow exhaust like a Banks system. Any suggestions or opinions? Anybody using a Banks, or similar, system?
Tom
Been using the Banks Power Pac on my 95 454 Burb since new. Have no

regrets at all. The headers are stainless and have held up very well. With

the exception of some rusted clamps (not stainless) and one cracked

intermediate pipe replaced at 110k under warranty, the system has been

outstanding. At the same time I insatalled the Banks system I did a few

other upgrades.. An Acell 300 cd double strike ignition,(really smoothed out

the 454 lumpy idle). Jet-six Pac programable computer chip, 160 degree

stainless thermostat, Bosch Plus-4 Platinum plugs.

!!!!!MAINTENANCEMAINTENANCEMAINTENANCEMAINTENANCEM AINTENANCE!!!

I know some would question the upgrades, especially on a new truck,

after all, it was a bunch of $ to spend for what turned out to be, on

average a 3mpg improvement. Spread that out over 160k and I think it was

well worth it. Plus the performance both towing and not has been GREAT!

Would I do it again? I would definately do the research on what is avail-

able, and if we planned to keep the new tv as long as we have this one, it

would most likely get done..............PLUS...... IT'S JUST FUN BE'N A MOTORHEAD
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Old 11-01-2007, 04:38 PM   #24
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banks IS good stuff!

Quote:
yes, I know that...as do half the others here, who are also pilots....
IF only 1/2 the pilots here know this...

would you ALL please raise a hand.

i don't wanna fly with the other half.

mpg

put a good coat of wax on the rig,

make it slick and she'll be thrifty AND quick!

cheers
2air'

and don't forget the a e r o dynamic issues....
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Old 11-01-2007, 04:46 PM   #25
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CHUCK:
Sorry for confusing you with my earlier post. I was in the middle of my first cup of morning coffee and that with the Sox winnin last weekend- well being raised in NH I'm still all wound up, matter of fact I'm not sure I want to raise my hand. and because I went to a forum rally I missed all 4 games!! ouch BUT I see Andy cleared up all the confusion.
I have a hard time waxin the belly pan 2air!
add VG's to the top of the airconditioning unit, get two tenth's percent advantage! DG
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Old 11-01-2007, 05:04 PM   #26
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Just curious, can you put one of the vacuum gages for fuel on a diesel, and if so, how big of a job is it? Oh yeah, good sources would be nice to know also . Thanks.
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Old 11-01-2007, 05:27 PM   #27
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Quote:
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and don't forget the a e r o dynamic issues....
No problem here....

Many of us have taken the aerodynamic issue seriously and reaped the benefits. Putting an aerodynamic vehicle in front of the bullet allows the Airstreams full potential to be realized.

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Old 11-01-2007, 05:30 PM   #28
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yeah baby, u r rulin' the road in red!

i love it.

vacuum gauge of limited value (none) on fuel injection set ups...

the the foot on an egg shell analogy relates very well to the 'economy' side of using a vacuum gadget this way...

besides leaning out the fuel on higher compression engines can be taken too far...

and with bad results.

make a diesel power plant too lean, and kill it.

that's less of an issue with carb'd gassers that sort of slop juice in to the fire hole...

that's my understanding.

2air'
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