extra 3miles 2 gal
 

i wrote last week m flash adds power , finished my first tank of gas normally the gas light comes on around 200-215 miles this time 240 big difference.went from 16mpg to 18.9. that is city driving and ac most of the time .i was so proud of her i gave her a bath and fresh coat of nxt.

I got the flash last week and filled up yesterday. I have used more than 1/2 tank to go 100 miles. Average speed 80mph.
I hope it improves mpg but the way I drive I doubt it will.
I did notice that it smooths out the power curve a bit. I used to get more of a kick between 6 and 7,000 rpm.

mine is just the oppisite i feel like i get a kick after 6,000rpms ,it feels like i hit another gear and i also drive like you do foot always inthe gas are youusing mid grade gas?

I'm half way through my second tank after the M flash and it looks like my average 16 mpg is now over 18 mpg. Definitely smoother acceleration in full auto.

mm

he has a 6mt and both of you have the AT.
Maybe this is the discrepincay?