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Improve mileage on class C - 440ci Jeff B 11-22-11  
I have a 1978 Brougham 23 ft class C on a Dodge 350 frame. The 440 engine has one 4 bbl carb. It has 60,000 miles and has been well looked after. Still it gets only around 6 mpg. I have kept it in tune and serviced the trans regularly. Any ideas how I can improve mileage? Would be happy to do the right mechanical upgrades to the engine if they would be effective in increasing mileage. All ideas welcomed. Thanks!
Re: Improve mileage on class C - 440ci BUBBA THE BUS TECH 11-22-11  
In 1978 Dodge was deep into the era of the Thermo-Quad carb. It works OK after a bunch of tuning work but is generally junk. I take grat pleasure tunning them with my favorite 5 pound sledge.
1st buy a Edelbrock carb and have pecision tuned, this will raise the fuel economt about as much as external stuff can. A good tune will re-curve your distributor and jet the carb correctly.
Next a set of headers and a free flow exshaust.
Finally a rebuild that includes an increase in compresion and a setting the cam timing properly.
As you can see even the basic stuff cost good money for relitivly little gain. The carb might get 1.5 to 2 MPG if your carb is as bad as they usually are and you won't see over 10 MPG after having spent 3 to 5 thousand dollars in parts and machining.
You can still buy a bunch of fuel for 5 grand.
Good Luck
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