Thanks a lot for everyone's comment again!
Now I feel better about my car.
What type of gasoline do you use for Fit? Lower one? 87? 89? or 92? Which one can make the best MPG?
I have tried at around 2K RPM to accelerate from a full stop. But it's slow, and I feel I block the car behind me. So I have to step on gas harder to get a faster acceleration with RPM at 3-3.5K.
I also heard that to add an intake can make the car more powerful. Does anyone have a suggestion about that?
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