gas problems -

Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

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Old 07-13-2014, 05:23 PM   #1
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Default gas problems

i have a 67 mustang 302 , slightly built up msd.coil, and distributor, a 625 demon carb , platinum plugs set at 45 , gas mileage is about thirteen on highway at 60to 65 mph thinking of putting smaller jets in, i do a lot of cars shows that are a distance away any suggestion thank you for any help
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Old 07-13-2014, 09:44 PM   #2
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all fixes cost a lot. aod, taller gears, efi, taller tires. and better gas does help alittle.good luck
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Old 07-14-2014, 10:35 AM   #3
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That was it back in the day of $0.45 per gal. No one look for millage. If you want economy with performance got to drop in a modern injected engine. Or, as 68gt/cs said taller gears and maybe convert to the Holley TBI.
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Old 07-14-2014, 06:06 PM   #4
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Step 1 is to properly tune the carb. Usually this requires some time on a dyno/sniffer at a shop, or some expertise and an air/fuel sensor installed in your exhaust. Until you tune the carb properly, you're likely to suffer driveability and/or fuel mileage problems.
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