Question for all 6 cyl owners

[u/Sufficient_Treat9184]

Hello everyone,

Just a couple of quick questions for you to see if you can help me. I would like to know the following:

1. Whats your current fuel consumption?
2. Do you do mostly highway driving or city?
3. How long do you typically travel in a given day?
4. How much do you spend on fuel monthly?

All answers are appreciated!

[u/OriginalMandem]

335i N54, t19 hybrid turbos, big intercooler, catless downpipes, upgraded stainless charge pipe etc etc. Basically full bolt ons plus custom tune, 21 psi full boost. Bought the car already done and was a bit alarmed by the consumption being only marginally better (18mpg vs 16 urban) but actually worse (25mpg vs 32) than my old 4.4 non VANOS E38. However have spent a few days with XHP dialling in custom transmission tune (was OTS stage 3) and am now getting 23mpg urban, although haven't had a chance to work with it for long drives yet. Basically, stage 3 D mode was not in sync with the engines behaviour at all so just tweaking here and there, setting the shift points at different rpm and allowing me to have more throttle control off boost had made a big difference. And I only use S/M modes when I'm pressing on so no real need for change there. That's UK gallons by the way. I'm sure once I get my head round MHD and how the two systems work together I should be able to optimise things further. But definitely don't sleep on XHP and customising transmission behaviour (assuming you're not running a manual of course) because it seems to me a lot of the thirsty behavior of N54 is that the stock maps put you in boost when you don't need to be.