i drive 60miles a day and my tanks last about 6days, shell 91 octane. i havent tried to go any further, but i stretched my tank to 410miles before i filled up a couple times due to short on money. 00 lexus gs300 133k miles

 

I will be doing a full tune up.
Oil change, air filter, gas filter, ** already changed sark plugs**
Am I leaving anything out?

 

the 300 never got good gas milage, the nature of the 2jz.

however, its "normal" compared to my 4runners 3.4L v6. thats just a veteran football player at a college frat party.