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Thanks for the reply I've looking into some stuff about this I think there is a little room for improvement possibly slightly more than what you may have gotten but that also could depend on what car you have and the options on it.
My thoughts so far are these: cleaning up in general like niky mentioned, adjusting rpms at idle (less revs at idle would help especially on older cars that might have developed a high idle over time) adjusting automatic transmission shift points and shifting precision as well as some other parameters there.
The A/T shifting will save fuel at least for me as there are people that have gotten good results from cleaning up their transmission already in j-body cars and I'm sure just about any auto could improve from cleaning up the parameters there.
I'm also wondering about improving the low end tourqe since this is a big factor in fuel economy. If you could get better acceleration at lower rpms this will help both auto and manual trans cars because it will allow for lower rpms through out the gear range if done properly.
I'm still researching this so I will post back as that continues.
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