Depending on what you do, or where you live, the E Locker could be your best friend. Remember, the E Locker is only engaged in 4Lo and not in 4Hi. As far as decreased gas mileage, that is determined by whether or not you go with the Big Tow package 4x4 or the standard package 4x4. The Big Tow has a lower gear ratio so it is going to have a few less mpgs. Many member here say (and I agree because I have it) to go with the BT package if given the choice. I think it's worth it just to get the BT mirrors :lol:. Also, do you plan on towing much with the truck? If you are not going to tow/haul anything, then there is no need for the BT package.2007 TITAN LE said:How useful is the rear Elocker in real world conditions? I know it is very useful in hard core off road conditions, rock climbing, deep mud etc. How useful is it in snow? Does anyone find it useless? Has anyone kept from getting stuck because of it? Is there anyone that has it that regrets gettingit. Do you think the OR and Pro 4X packages are worth the extra cost and decreased fuel mileage (due to the gearing) vs just a plain 4x4? I am referring to the functional added off road value that the gear ratio, Rancho shocks, BFG Rugged Trail tires, E locker, skid plates etc. offer. Not considering the looks of the packages, stickers, guages, leather, rims etc.