Gearz 6 tips to increase fuel economy

[LarryJ]

Saw an episode of Gearz today offering 6 mechanical tips for better fuel economy for late model vehicles? I'm not a gearhead. What do you think would work best for a 2003 tundra, if any, and what percent increase could be expected.

1. increase intake air flow by replacing air filter. They didn't distinguish between warm air intake vs cold air intake. I've read about warm air intake is definately the way to go for fuel economy.

2. Computer programming. They suggest recalibrating vehicle's timing/shifting.

3. Spark Plugs. Replace spark plugs with mult-tipped plug that suppose to burn fuel more completely.

4. Exhaust. open exhaust to increase air flow with cat-back system and beter yet, high-flow cat and even headers.

5. Synthetic Oils. replace oils with synthetic

6. SVO. related to converting diesel to run on SVO.

thanks