Take it to the dealershiop, Thats what i did, it would only let me fill like 13 gallons up and i was getting like 13 miles per gallon, It was some sensor that went bad and was giving it more gas then it needed

 

20mph with an even balance of highway and city

 

i took a 170 mi trip this weekend with first half being 65 mph speed limit and the 2nd half was 70 mph. the first half i averaged about 70 mph, there was traffic and such. and i topped a whopping 30.2 mpg off the trip computer!. it turned to 70 mph (i didnt reset the computer) and it was wide open i was going between 80-85 mph. i watched the mpg sink down to around 29.4. an expected result for higher speed but i was really surprised i cracked the 30 mpg barrier. seems to me the speed for optimum highway mpg (for my car anyway, stock except for a popcharger) is around 70 mph.

 

Less than 2000 miles on the car and getting 18-22 mpg, mixed city and highway driving.

 

My average over 4k miles is 25.3.

I am incredibly impressed.

 

like 20. (i'm guessing). I don't pay that much attention....

 

i average 13.9 with my new 07- I have a lead foot for sure

 

Sigh... you were the guy who started https://my350z.com/forum/2003-2009-nissan-350z/260594-13-miles-a-gallon.html and never answered on how YOU calculated your "13" mpg.

I get roughly 21-23 mpg w/about 60-65% highway driving by time. The Z's trip computer is reasonably accurate, usually 0-1 mpg off, but typically with ~0.5 mpg. My Prius on the other hand is getting a lifetime avg so far of ~45.6 mpg.

 

is it possible to somehow lower the turbo power and increase fuel effiency