Maik04

i got a sc400 and I'm doing a complete tune up with oil, fluids, belts, rotors, sparkplugs, etc.
Just wondering what tune-up bits would be most beneficial for gas mileage?
I'm think k&n drop in filter, spark plugs and wires, new gas cap, sea foam to get rid of carbon build up, pcv valve what else am I missing?

Dawa

iTrader: (5)

I'd say you're on the right track with all that you have planned. Ive heard both success and horror stories in regards to sea foaming so I'd stay away from that.

only thing I can see missing off top is fuel filter.

greens14

iTrader: (28)

turboing it lol. im just saying! or a tune. but if you mean legitimate tune up instead of modifications youve got the list covered.

2jznosht

icm, igniter, cap, rotor(if applicable on your year 400)

ihiryu

iTrader: (7)

Seafoam! That always seems to make a huge difference on my car lol