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Old 07-24-2016, 01:35 PM   #1
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1986 345 with a 454

I have change the plugs and the wires on the 454 but do not get very good gas mileage any ideas on what else I can do
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Old 07-24-2016, 03:18 PM   #2
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About 8 MPG seems to be what most people get. What kind of mileage are you getting?
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Old 07-24-2016, 03:30 PM   #3
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A 345 with a 454 is not going to get good mileage. If you're getting 8 with a 345 I'd be surprised. I would expect more like 5.5 to 7 mpg.

About your only option to improve mileage is to install a Gear Vendors overdrive or change to a 4L80e transmission. Of the two options the Gear Vendors is by far the easier of the two to install.
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Old 07-24-2016, 03:42 PM   #4
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Take out the plugs and wires and go diesel.

"L" is right, 8mpg US is top of the range with 6 mpg US in the hilly stuff or towing a toad. You have to remember the 454 got pitiful gas mileage pulling 6,000 lbs cars, let alone pulling 16,000+ lbs of moho that pushes aside a lot of air.

All the other things you can do are big buck stuff, like converting to diesel or adding a modern 502 RV crate engine with better fuel systems, or like Brad stated with the Gear Vendors OD.

Just to make you want to puke, my turbo diesel 310 costs me roughly $12.00 per hour to operate in 55 mph country style driving; that's just over 19 mpg per Imperial gallon.

Cheers
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Old 07-24-2016, 03:43 PM   #5
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I am getting about 6 mpg
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Old 07-24-2016, 03:45 PM   #6
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And that is towing 2 quads behind me
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Old 07-24-2016, 03:49 PM   #7
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And that is towing 2 quads behind me
It sounds to me like you're at the top end of the range you can expect for mileage. The only thing I ever found to improve mpg on a rig your size was to ensure the air hose to the carburetor is out in front of the radiator.

In an old 27' Winnebago with a 454 I went from 5.5 mpg to 6.5 mpg by adding a hose from the carburetor air snorkel to the front of the grille so the engine was breathing cooler air.
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Old 07-24-2016, 03:53 PM   #8
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I will have to try that and I live in a higher altitude than most of you do
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Old 07-24-2016, 03:55 PM   #9
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I will have to try that and I live in a higher altitude than most of you do
Altitude certainly isn't doing you any favors so if you're getting 6 mpg then I'd say your rig is in pretty decent tune.
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Old 07-24-2016, 03:56 PM   #10
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That's good to hear thanks it runs great


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Old 07-24-2016, 04:05 PM   #11
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A ram air scoop, even handmade, would certainly help a lot, as would a clean air filter.

The only thing I could add is the weight issue; pack the least amount possible, don't travel with a full water tank or waste tanks if possible , even buy gas for the quads closer to your destination.

The rule of thumb for weight is, for every 100 lbs you carry, you must add 10 hp to your vehicle to maintain vehicle performance. Weight, or lack of it is the best mod to make with these rigs.

BTW Please post some pics of your coach if possible.

Cheers
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Old 07-24-2016, 04:14 PM   #12
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Click image for larger version

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Old 07-24-2016, 04:15 PM   #13
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What can I use to polish it


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Old 07-24-2016, 04:56 PM   #14
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Lots of polishing info in this part of the forums:

http://www.airforums.com/forums/f441/

What have you used so far? It looks pretty good.
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