I have a 2006 Toyota Tacoma pickup. Four door, long bed, 4WD, 4.0L V6. I chose this truck because it was the biggest Toyota pickup without getting a V8. I am a luggage courier and I need the cargo capacity -- I regularly fill the backseat and capped bed with suitcases. I often carry heavy loads, probably over the half-ton limit. In the seven months I've owned this truck, I've driven it 47K miles. Since I'm the one paying the gas bill, I'm willing to work on raising my MPG. I've already started slowing down. My 45 mile one-way commute used to be above 80 MPH, now I'm usually poking along at 65, cruise-controlled. Will raising the PSI affect my load capacity? I know to check the pressure after carrying heavy loads (even if I don't always...) I'm shopping for new tires. While I'll probably go for a meatier tread for the winter, what should I look for, aside from wear rating, for a regular all-season? I haven't decided whether I'll get something like an all-season like the Cooper Discovery or if I'll get snow tires. I drive through all of New England's weather -- blizzards, monsoons, anything. I rarely use 4WD in anything but the most extreme weather. My delivery runs can be anywhere from 200 to 500+ miles. Mostly I head out of town, but I will do local deliveries in the Boston area. I avoid driving during hours when there's any sort of traffic. I use Mobil 1 and change my oil religiously at 5000 miles. I'm looking to change to a higher-mileage oil since I do 5000 miles every month. I'd go with the 7500 but still get oil changes every 5000. Just extra protection. I'm not comfortable with lowering the oil viscosity -- I feel it needs the protection because of the heavy hauling. I plan on keeping my truck for 300K miles. Deliveries are time-sensitive so I don't always have the option of taking it easy. I do usually set the cruise slow on the drive home, unless I'm trying to get home before rush hour or I fall asleep behind the wheel. 20-hour work days aren't uncommon and though I have no problem sleeping in my truck, my bed is much more comfortable. I calculate my MPG at every fill-up. I average high 19's to 21. Max was about 22 with long stretches of highway on a trip to Maine. EPA is 17-21. The truck's transmission is very shifty. If I set the cruise and don't speed up before even a small hill, it'll shift and rev the engine over 4000 RPM. What else can I do?