I know that many things come into play here such as rim/tire combo, but what rpms are you automatic guys seeing with 4.10s at highway speeds (55-65 or so). I think we are going to go with the 4.10 but I would like to be able to pull 24-27 mpg on highway driving. Do you think that is possible with the 5 speed automatic and 4.10 and a tune? We have the stock 18 inch polished rims for now and will probanly keep them for the neqr future. Thanks to everyone who responds.