16 mpg City / 25 mpg Highway.. heres how I did it

[rambino]

When I got my X6m, I avg'd 15 mpg at 70mph and around 10-12 city..

Im now happy to report I have raised it to 16-17 city and 25 mpg at 80mph highway..


Crazy you may say, insanity you may yell, lies you may scream.. but I assure you its not.. and id be happy to provide video proof of it...

Heres how I accomplished this.. Some of these mods May or May not attribute to this, but ive listed them anyways..

1. ESS tune (Although I dont think the tune/stock would make a difference I do feel my ESS tune is more efficient

2. Custom Highflow intake.. I have a thread on my setup elsewhere but I believe this greatly increased air flow into the engine

3. Downpipes to Supersprint Mid-section w X pipe to Megan Mufflers.. I dont run cats or resonators. My car is Quieter than Stock around town and is only loud when on full throttle.. The X pipe system from Supersprint (also Akropovic) is Highly efficient at increasing exhaust velocity while neutralizing exhaust pulses which makes the exhaust very quiet.. a sign of true efficiency

4. Heat wrapped Downpipes for more velocity flow and a Turbo blanket from PTP under the heat shields for more Turbo efficiency effective boost

5. Aftermarket diffuser with fins and a deck spoiler.. they work well to smoothen air flow around the car and remove turbulence... working Aero kits are very effective..

I make around 650hp and run 25 Mpg at 80mph...I believe the combination of heat and velocity management, a good tune, proper aero, increased intake and exhaust flow all add up to the 16/25 mpg I get.. its a Massive improvement from what I ran as OEM and im happy to provide proof for anyone who doubts this is achievable.. all on a 6 speed auto box... not bad..

**When I install my forged wheels and lose 80lbs of unsprung weight = to 480 lbs removed from the trunk, Im aiming for 27 mpg***

Cheers!

[GTB/ZR-1]

Wow--that's really impressive...

Is that a display reading, or calculated @ fillup?

I just got my new (to me) X6M that has Akra DPs & RPI axle-back & was only able to get ~20 MPG on the highway @ 65-70, after a reset & closer to ~13 MPG/city.
Placing a Velos tune on it shortly & hopeful that'll help some.

Thanks for posting & nicely done!

[Bilbofraggins]

15 mpg city... 17 mpg highway....I thought that was acceptable until reading this.... My MPG improved when I switched to LL04 5w30 from LL01....either way never burn oil....

[protecon]

You don't buy an M to worry about mileage.

[mirob]

Originally Posted by rambino

5. Aftermarket diffuser with fins and a deck spoiler.. they work well to smoothen air flow around the car and remove turbulence... working Aero kits are very effective..

Adding downforce (drag) to a brick will not increase your MPG.

[Bilbofraggins]

Originally Posted by protecon

You don't buy an M to worry about mileage.

I certainly can’t see putting thousands into mods to save gas money... if that was the main motivator.... I love this motor as it is....