You should be set i did a 3000 something mile trip in my ra, i just used the manuals 32psi in the tires and pretty much did what they said and i didnt have any issues. except i set my cruise around 80-85 and i was still getting like 100 more miles a tank than i usually do.

 

When cruising, while the AC does leech power, it doesn't make much of a dent in the MPG (less than 1 mpg). Best option, if it's not too hot out, is to use the defrost instead of the AC. Then the compressor will only run about 30% of the time.

 

As long as you stay under MIVEC you'll be fine.