2018 BMW 340i HWY MPG?

"Dark chocolate" (amghybridss)
09/17/2018 at 15:01 • Filed to: None

So I gave the 7 in for service and was handed keys to a new (800 miles) loaner 3 series. I never cared for it until, I realized they had given me a 340 and not the typical 328 / 330.

This morning while on my regular 52 miles drive to work, I averaged 38.6 mpg as indicated on the DIC. And Yes I reset it as soon as I started and yes, I was on cruise control most of the time.

The damm thing is rated at 32 HWY. And I am know to extract good numbers from vehicles.

Case in point,

I have averaged 26.0 mpg (indicated) in my 23 mpg rated Grand Marquis.

I have averaged 34 mpg (indicated) in my 30 mpg rated 7 series.

I have averaged 58 mpg in my 42 mpg rated Passat TDi.. but we all know how that one went. (verified at pump)

So question, is the 340i actually a efficient car when driven gingerly? Any opponauts have any experience?

DISCUSSION (4)

My X-type is too a real Jaguar > Dark chocolate
09/17/2018 at 15:15

Highway miles I regularly get 34-36 MPG out of my 535 with a very Similar engine, my father has a 335 GT it gets around the same, both of these are heavier than the current 340i

Discerning > Dark chocolate
09/17/2018 at 15:16

I don’t have experience with the 340i, but I imagine it has something to do with the way they calculate highway fuel economy.

I averaged 34 mpg in my old q50 3.0t while cruising at 80mph for roughly 300 miles, and that thing was rated at 26mpg highway.

Textured Soy Protein > Dark chocolate
09/17/2018 at 15:23

Best I’ve managed in my 335xi was 31 mpg on an extended highway cruise from Wisconsin to Maryland. My car is modified and awd and the 340i has the new B58 motor which is supposed to be more efficient than my N55. So...maybe?

Galileo Humpkins (aka MC Clap Yo Handz) > Dark chocolate
09/17/2018 at 15:30

I can manage close to 29 mpg highway on the SQ5, rated at 24 highway - and not necessarily cruising along gingerly. But a few conditions have to be right. So I’d imagine that, yes, the 340i can be somewhat efficient under the right circumstances.