fuel mileage, things to improve it

[Boog]

Once again gas prices are jumping up and gas mileage is of a concern. We love our old trucks. Some of you are installing LS engines with full computer controls to get the most out of your install but many of us are sticking with the old carb'd versions of our trucks and are interested in getting the most out of them too.
I'll mention justs a few things we can do to promote better fuel mileage. Please mention your combo and list things you have done to increase yours. This applies to your big blocks as well.

1 fresh tuneup( plugs, wires, cap, filters etc)
2 180 to 195* thermostat
3 free flowing exhaust
4 front end alignment
5 proper tire inflation
6 evaluate tire width ( wider tires have higher rolling resistance )
7 bed covers ?
8 lowered for good looks ( possible better mileage too )
9 multiple spark discharge ignition ?
10 gear swap to more mileage suited ratio

I'm sure there are a lot of good ideas out there.