1) Use only 0W-20 for best fuel economy.
2) Use OEM plugs. They are indexed plugs. You must match the plugs to the letter stamp on the cylinder head(A, B, C, D).
3) Sure, seafoam won't hurt anything.
4&5) Good things to do overall.
How many miles are on the car? You'll likely want to clean the EGR plate as part of the tuneup.
Plenty of people install amplifiers. The DC-DC converter is rated at 70A, so it's like you have a 70A alternator.
City driving is tough. Being new to the Insight, you have a lot to learn. Practice keeping your battery full by minimizing assist useage, and maximizing regenerative braking with downshifting and leaving spaces between you and the car in front of you.
PCV valve, air filter, cabin filter.... Valve adjustment if they're noisy.
Try 45PSI. Does the car have the original OEM Bridgestone RE92 tires? If not, you'll want to get them ASAP.
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Insight #1 - Silver '01 5MT @ 158,388 as of 7/11 - Best Tank: 84.5MPG over 807mi

Insight #2 - Silver '01 5MT @ 450,000 as of 1/12 - Best Tank: 86.0MPG over 800mi

Insight #3 - Silver '00 5MT, MIMA #163P, BCM Gauge, OBDIIC&C Gauge, BetterBattery @ 228,869 as of 1/12 - Best Tank: 78.4mpg over 687mi
Last edited by Eli; 09-30-2011 at 05:23 PM.
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