Best breakout to use for steady, low linear acceleration

i want automotive measurements while driving, means we're talking gee or 2 , need steady stream of jitter-free data in 1 linear direction far more important having huge acceleration range or shock detection or that. 

most of common breakout boards have seen, or own myself have 1 of 2 problems regarding application:

1) measure rotational acceleration values, useless me
2) actual numbers see in serial output jump on place, on so-called "calibrated" units , don't appear have meaning either.  -761 mean?  milli-gees?

anyway, i'm going assume don't understand how work , asking if can recommend breakout board has arduino library, sample sketches , work low gee values in linear direction, low jitter on output.

i own gy-85 far i'm aware has rotational accelerometer, right?  when see tested in youtube vids values change when board rotated.  i'm assuming therefore can't use vehicle application? 

thank you.

i pursue research follows.

1. accelerometer boards on net.
2. flag deal 3 axis linear acceleration, , compatible arduino. 
3. go find out which  of these have arduino library available.  libraries have example programs instruct in how read , interpret acceleration readings.

bear in mind accelerometers measure acceleration, , don't accurately unless aligned on moving object.   gps can provide acceleration readings accuracy, , lot lighter mathematical load.

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