69 charger gas mileage?

Question:
why would i only be getting 9 mpg? i just got my carb 650cfm tuned on my 383 magnum...i thought they got like 17 to 19 mpg?

Answers:

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I had a '69 Plymouth Road Runner with the 383cid and an automatic transmission. The engine was completely stock including the Carter AVS four-barrel carburetor. It averaged 13mpg with the 3.55 ratio rear axle and 14mpg when I changed it to the 2.76 ratio. The worst mileage was 9mpg. The several 318s (5.2 L) I have owned, including all three generations of engines this size, averaged 15mpg. You may want to check to see if your speedometer/odometer is accurate. Tire/wheel sizes and axle ratios could have been changed in the past 37 years. I changed the speedometer pinion to compensate for the axle ratio change on my Road Runner.

I need to know what is the best sporty sedan to drive? Is it Acura or Lexus or etc. Please explain..?

9 to 13 miles per gallon

ok same question about cobalt ss supercharger for you stupid people?

Check the timing, including the vacuum advance.

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Check for normal vacuum at idle.

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Check spark plug gaps.

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Verify that the carb is the correct size for the engine and verify correct float level.

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Be careful how you drive it. Rapid acceleration = poor gas mileage.

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9 mpg is pretty good for that car/motor combo. That is a HUGE 8cyl motor in a very heavy car 9 mpg is good if you do not believe me look up the original specs for that car and you will see that 9 mpg is good for the General Lee.........

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I had a similar problem with my dads old pickup. My friend sent me this article, following it has helped me a grip, so- i hope it helps for you too! The comprehensive to-do list is at www.cargens.com

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keep your foot out of it and putsy around or sell it to a gearhead that won't complain.
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