Maintenance? 70k

So what things have you guys done at 70k? I have a 06 with a lil over 70k miles and wanted to know what have you guys done. How did you guys get better mileage. it a 4 cylinder auto

 

does this stuff work and if soo which one do you guys suggest? fuel injector cleaner?


http://www.oreillyauto.com/site/c/search.oap?keyword=fuel+injector+cleaner

 

seafoam is the best for getting the gas better and cleaning everything?

 

my bad better gas mileage and change spark plugs? what brand are good?

 

That's what I use...about every 5th tank of gas. FWIW

 

Is that a little overkill using Seafoam every 5th tank? Can it damage anything in the fuel system or engine by using it that often? I'm just asking b/c I am at 42,000 miles and was thinking of using it before my next spark plug change.

 

Not to my knowledge...starting doing it after a friend told me that is what he had done for the life of his Hyundai Elantra (commuter ride)...car is still going strong a 218K (his son has it at college now)... he never had any repairs over the normal timing belt, tune ups, brakes, and struts and such. I didn't think a Hyundai could last that long.