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I have been going strictly by vacuum gauge lately. For my 55 mph zone. I have been running it up to 62 mph on the slight downgrades. Then down as low as 52 usually due to the next incline. Vacuum I do my best to keep right at 5 during acceleration. Started trying this out due to some cooler weather bringing down this routes mpg. Trying this bumped me back up to 52.6mpg vs 50-51 that I was consistently getting with weather under 50°. Vacuum is good lol
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