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inh RPM  SPD TIME     GEAR Distance     Elapsed  Miles         (elapsed = since last data point)
inh 4486 0   209.813  N    0            0        0             (spd*elapsed)
inh 4607 2   209.875  1    3.44444E-05  0.062    0.000034444   (spd/60/60*elapsed) (miles/sec)
inh 4688 3   209.9221 1    9.98611E-05  0.0471   0.00003925    
                                        -------  -----------
                                        0.1091   0.000073694   total time | total distance
           
0.000073694 miles / 0.1091 secs = 0.000675472 miles/sec avg
                           60 * = 0.04052832 miles/min avg
                           60 * = 2.4316992 miles/hour avg

0.25 miles * 2.4316992 mph = 0.6079248 hours for 1/4 mile
                      * 60 = 36.475488 minutes for 1/4 mile
                      * 60 = 2188.52928 secs for 1/4 mile