The Classic Opel Forums - View Single Post - Fuel economy 'how-to' thread

73Manta72gt · 09-02-2005

I was surprised to see how low some of the MPGs were...I checked mine on the highways 60-70mph. 72 gt with a 32/36 carb. everthing else stock 34mpg 73 manta with a 32/36 and a 5spd getrag always gets 31.8 when I check it.

Has anyone used an exhaust gas analyzer to check the mixture and adjust the
carb leaner?..

how about a mixture control like airplanes have..at a steady state speed on the highway you should be able to lean the mixture. I think the one on my plane is just a needle valve in the fuel supply line to the carb...

09-02-2005	#2 (permalink)
73Manta72gt Member Join Date: Nov 2002 Location: Winston-Salem, NC Posts: 341	I was surprised to see how low some of the MPGs were...I checked mine on the highways 60-70mph. 72 gt with a 32/36 carb. everthing else stock 34mpg 73 manta with a 32/36 and a 5spd getrag always gets 31.8 when I check it. Has anyone used an exhaust gas analyzer to check the mixture and adjust the carb leaner?.. how about a mixture control like airplanes have..at a steady state speed on the highway you should be able to lean the mixture. I think the one on my plane is just a needle valve in the fuel supply line to the carb...