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Quickest return on investment, lift axle or ported manifold?

I am considering what improvements to make next to increase fuel economy. I am going to be getting the ported and coated manifold and bigger turbo for my 3406E CAT. I am also going to put a lift axle on my spread axle flatbed. I'm trying to decide which one will give me the quickest return on investment, so I can decide what to do first.

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Lift axle would probably glean you the most payback for your dollar but it's also going to cost you more than the manifold.''italic text''

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To be safe I would guess they are both going to gain you 2 tenths, so which ever one you can get done cheaper would be the one to do first.

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I am running a single drive with a tag axle I pickup 4 tenths. Now the exhaust manifolds pickup exactly nothing other than lower exhaust temp.

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Are you happy with your single drive with tag, is it liftable? I am about to have Fitzgerald's build me a glider and this is one option I am considering. I spoke with a contract mail hauler Sodrel truck lines, with 200+ rigs like this and after 30 years they still like them. I run mty 25-40% of the time. What would you do different if you could do it over. Also would you run trailer tires on lift axle or rotate drive tires between the 2 axles to even out uneven wear? Thanks.

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Bruce Roberts will be eternally grateful.
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