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My Jeep works this way as well. Mines an automatic which I think is part of the problem. At 55mph on level ground the ScanGauge reads somewhere around 27-29mpg at around 2100rpm. At 35mph it reads at most 20-22mpg but around 1400rpm. Push the speed up to 38-39mph the rpms go up to 1500-1600 and you get about 1-2mph more.
At idle my Jeep pulls around 0.75gph. Is it just you have to get to a certain speed to counter act the shear amount of gas the engine needs just to spin?
All the more reason to encourage people to pick up a ScanGauge I guess.
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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