I just got my '99 Sonoma back from the trans shop, and I'm disappointed with the shift tuning. It's too late with the 1-2, 2-3 & lock-up, while the 3-4 is too early compared to my '94 with all the same powertrain parts & FDR. As well as tire size. Not to mention it downshifts unnecessarily on the highway, compared to the '94. I think this may be lending to my shoddy mileage (Can't get even 17mpg.avg. vs. the '94's 24.7). Any advice, suggestions or maps I can use?