honestly, acceleration is not the most important part, coasting is. you can't constantly look at a screen on your dash to check if you are accelerating corectly, at least safely, but spend time and learn how to conserve momentum and coast as much as possible because that's how you get the good numbers. and if you're on the highway most of the time so you can't coast just go as slow as sefely possible.
on my trips i probably spend about 5 % of the time accelerating so even if i do it completely wrong it won't hurt my milage too bad. go over the trips that you do and find out how much time (in procentage) you need to accelerate, hold speed, coast, idle and focus on improving the ones you spend lots of time doing.
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