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If you have the stock fuel system then you have the carter thermoquad carb.
I am used to old dodges with the thermoquad run so rich they roll coal.
Why not swap it out for something you can tune like an edelbrock 650, advanced tuning kit and an air/fuel ratio meter?
When a lifted up ram charger with 318, 4.1 gear and 727 transmission can get 12 to 13mpg by some one obsessed with keeping everything stock, to include the junk thermoquad carb you should be able to do a lot better than 7mpg.
If you want better fuel mileage there really isn't any point in modifying anything until you get it running correctly.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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