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Old 01-15-2008, 01:18 PM   #1
3 Rivet Member
1986 34.5' Airstream 345
Tyler , Texas
Join Date: Jun 2007
Posts: 110
Better gas mileage

Hi! I have read several posts about you guy's getting 8+ mpg. When I bought the 345 I was getting 6mpg with toad and genset running. New plugs, wires and tune up and still get 6mpg at 2800 rpm without toad and without genset.
This unit has the Banks system and from what I have read I should do better than 6 mph. New carb maybe? any suggestions today's gas prices I spend a lot of time just looking at it rather than using it.

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Old 01-15-2008, 01:48 PM   #2
1 Rivet Member
1986 34.5' Airstream 345
Lafayette , Louisiana
Join Date: Jan 2008
Posts: 12
Pete, I have not driven enough to get a measurement yet. I'm curious to find out and hope I'm on the good side of 6mpg. Let you know.

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Old 01-16-2008, 07:52 AM   #3
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1986 34.5' Airstream 345
Speedway , Indiana
Join Date: Dec 2005
Posts: 421
We get 7 to 7.5 mpg without genset 95% of the time with our '86 345.
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Old 01-16-2008, 03:23 PM   #4
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Las Vegas , Nevada
Join Date: Apr 2007
Posts: 608
we get 6-6.5 with our carberated 454, 89 345, but it gets much better on long downgrades,haha. Seriously though we have owned our 345 less than a year, did major tune up shortly after purchase, put about 12,000 miles on it so far and the more i'm learning how to "drive" it the better the gas mileage seems to be getting.
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Old 01-17-2008, 04:03 PM   #5
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1972 Argosy 24
1989 34.5' Airstream 345
Heart of Dixie , Alabama
Join Date: Sep 2006
Posts: 1,650
Images: 834

6 mpg is what I get on the Interstate...almost exactly.
Mostly because I can't keep it under 75mph.
Thats without pulling anything, and no gen, I think. (was October)

If dropped down to a max of 65, it gets 7.3 mpg.
(Sure was more fun at 75)

On two lanes, with a max of 55mph, it gives me 8.6 mpg.

This was all from a long road trip, with many fill ups, so I trust these numbers.
I don't have Banks.
Regular duals all the way back.
Your opinion is valued, please not your opinion of someones else's opinion.
Click To See Me Wet
1989 Airstream 345 Liberator...
1972 Argosy 24'...
1954 Feathercraft Vagabond
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Old 01-20-2008, 12:36 PM   #6
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1991 35' Airstream 350
Windsor , North Carolina
Join Date: Oct 2005
Posts: 210
Images: 4
Gas mileage

All: I posted this earlier, and copied it here as more germaine.

Over Christmas, we visited Virginia Beach, VA, driving from there to Southern Maryland with wife, dogs, and full tanks of fuel but no water or sewage. Between Virginia Beach and the fuel stop just short of the VA-MD line on US 301 we used exactly 11 gallons of fuel, covering 165 miles--which I make to be 15 MPG, @ $2.79 per gal. Averaged about 50 mph--heavy traffic in places.
We stayed over an additional day while a fresh storm with 40 mph winds blew through--QED

91 350 LE
MSD ignition

Driving mostly by cruise control, mostly flatland.

Best to all,

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Old 01-26-2008, 06:00 PM   #7
M Hohnstein
1987 34.5' Airstream 345
germantown , Wisconsin
Join Date: Apr 2007
Posts: 12
We have a 87 345 w/reman 454, Edelbrock Performer intake, ceramic coated headers, 700r trans/w GearVendors, tow a 240D Mercedes and cruise 65/70, 2500 rpm, dash air running get 6.5. Using the stock carb unmodified as the engine runs like a watch haven't changed it. Doubt there would be much improvement with a different carb. The mufflers are round reverse flow, don't know what kind. The geezer I bought the coach from took exceptional care of it, until the engine blew up and it cost him 8 grand to repower it.
He claims it always got over 8 with the old engine, but he talked about cruising it at 75 mph too. As I installed all the transmission upgrades, he was a buzzing the rascal, and I suspect he was as he suffered a valve train failure that necessitated the engine replacement. I have towed over a quarter million miles with big block powered Chevrolets of various chassis combinations, always got around 6. I suspect if one really tries to drive like there is an egg under the gas pedal, better mileage is possible.
I ditched the air pump, tubes and the basket of snakes vaccum lines, really cleaned up the engine room, rewired the 12v with a bunch of new circuit breakers, added a race car starter cause I like the sound they make. I wonder if I hurt the mileage a little, cause it's got great power now, that I like to use. I think that's what happens when one buys a Banks. Never hear about anyone getting better mileage with them.
I should mention the IPD sway bar and urathane bushing kits really took care of the handling issues. A great investment.
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Old 01-31-2008, 05:22 PM   #8
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1984 31' Limited
1983 31' Airstream310
Oriental , North Carolina
Join Date: May 2004
Posts: 180
To "M. Hohnstein" - please tell me about those Urethane IPD sway bar bushings - I need to replace mine as they are totally perished.
Thanks, Jamie
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Old 01-31-2008, 06:15 PM   #9
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Posts: 56
I have a 1977 24ft argosy MH I get 9.5 to 10 mpg (imperial gal.)
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Old 01-31-2008, 07:00 PM   #10
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Originally Posted by jking
..please tell me about those Urethane IPD sway bar bushings - I need to replace mine as they are totally perished.
Thanks, Jamie
hi jamie

here's a thread with the basic info and a link to one vendor...

see posts 2 and 6 (or read it all)

it's interesting to see the dismal mpg reports but a good reality check none the less...

i've still got my travel/maintenance/mileage logs from a stock 79 28/29ft a/s moho with the 454...

the average mpg was usually around 7.8-8.5 in those years and sometimes driving, really fast...

did all the typical mods after about 10 years (high flow exhaust, dt headers, air/intake, gearing, airdam, suspension, plugs/wires...

and always ran the tires at high pressure...

after the 'banks mods' the mpg didn't change but she did run cooler and quicker up to speed.

slowly as the years (and miles) passed, mpg declined some to the low 7s after 20 years of service...

i've always wondered it this was fuel quality related, an early sign of engine fatigue or some other process...

the ipd suspension mods were VERY noticeable and well worth the costs...

all of the true things that i am about to tell you are shameless lies. l.b.j.

we are here on earth to fart around. don't let anybody tell you any different. k.v.
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Old 01-31-2008, 09:40 PM   #11
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New Borockton , Alabama
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Given the engine, weight and age, I'd be bragging about 8 or 9.
Randy...Converters, Inverters, Trimetric, Surge Protectors, Zamp Solar, AGM Batteries
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Old 02-01-2008, 05:53 AM   #12
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1984 31' Limited
1983 31' Airstream310
Oriental , North Carolina
Join Date: May 2004
Posts: 180
TNX for the info on bushings - I'm ordering a full set of replacements for my IPD bars today. BTW I actually get 10-12 mpg towing ('84 310 with the 6-banger Isuzu diesel towing '07 Toyota Yaris) but I seldom drive over 60 mph.
73, Jamie
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Old 02-02-2008, 07:04 PM   #13
1977 28' argosy moho
scarborough , ontario
Join Date: Dec 2004
Posts: 64
I guess I'm getting old but I usually drive at 55 to 60. My old bus seems to have a sweet spot just below 3000rpm so I try to keep it there. My mileage has been up to 11 per imperial gallon and as low as 4 through the mountains. It is usually just under 10 per imperial gallon (about 9 per U.S.)
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Old 02-02-2008, 08:35 PM   #14
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2005 25' International CCD
Leesburg , Georgia
Join Date: Sep 2005
Posts: 292
Images: 5
72 Mpg

what's all this about? take a look @ PICC (pre ignition catalytic converter)
am i being hoodwinked by the techno garb?

can you image 8mpg x 9 (best effort) 72 MPG! for a 345 that would be awesome

i keep getting an error on the form for a quote though.

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