BMW M135i (2012–2019) — Interior Layout & Technology: An Eco-Adventure Driver's Perspective

Foreword — why interior and tech matter for eco driving

Cockpit ergonomics — purpose-built, driver-focused

The M135i carries BMW’s classic driver-centric cockpit geometry: the screen and central controls are angled slightly towards the driver, the centre console forms a natural resting place for the elbow and hand, and the gear lever or selector sits where you expect it. For eco-driving this layout is an advantage: the iDrive controller and physical switchgear let you glance, select and move on without wrestling for attention. Good ergonomics reduce cognitive load — you make smoother inputs and spend less time making inefficient corrections.

Seats in the M135i are bolstered and supportive; they’re designed to hold you perfectly for spirited driving. That can be a double-edged sword for long, economical miles. The lateral support keeps you planted, which prevents wasteful body movements, but the firm padding of performance seats can get tiring on long motorway legs if you’re trying to relax and sip diesel-equivalent economy. For an eco-adventure that includes a mix of B-roads and long cruising, I prefer seats that strike a balance: supportive without broadcasting every bump into your spine.

Instrument clarity — information you can use

One of the clearest advantages BMW provides is the instrument cluster: precise, analogue-look dials with a crisp central display that supplies trip data. The ability to see instantaneous fuel consumption, average economy, and range clearly is a practical boon. When you’re trying to optimise mpg on a rolling route that favours momentum over brute acceleration, that real-time feedback is essential. It lets you learn the throttle modulation that keeps the turbo charged six happily spinning without asking for excess fuel.

Infotainment & connectivity — a tool, not a distraction

The M135i’s central screen and control knob are designed to give you access to navigation, trip computer and media without forcing your eyes off the road for long. In practice, the system’s menus are sensible: trip and consumption data aren’t buried under layers. For eco-route planning, the on-board trip functions let you set realistic legs between fueling stops and to compare the fuel cost of taking a sinuous A-road versus a longer motorway run.

This car predates wide native smartphone integration that later models enjoyed, so you won’t find the same app-layer convenience. That’s not a fatal flaw for an eco adventure. In fact, the relative simplicity keeps you focused on driving. If you want full route planning synced from your phone, you’ll need aftermarket options or a phone mount — but I’d argue the M135i’s on-board tools are adequate for plotting efficient legs.

Controls that influence eco behaviour

Gating a car into an eco mindset often comes down to two things: how easily you can control the car, and how the car responds to light inputs. The M135i’s controls are connected and direct. The steering is communicative; throttles in modern turbo engines can be peaky at the top end but smooth in the mid-range. In this car the generous torque from the straight-six means you can cruise in a tall gear at modest revs rather than bouncing between gears — and that’s an instant fuel-saving tactic. In short, the interior and control layout encourage a calm, confident driving style if you allow it to.

Cabin packaging — practical for an eco adventure

Storage is sensible: door pockets that swallow bottles, a centre cubby for small items and a useful glovebox. If you’re planning a weekend eco-adventure with reusable bottles, food in Tupperware and compact camping equipment, you’ll find room for essentials. The rear seats fold to expand the boot, and the hatch format is inherently more practical than a saloon for loading low-drag luggage or a roofbox when you really need more volume — though be warned, roofboxes and roof rails are the enemy of low fuel consumption.

Climate control & comfort tech — small things add up

Air conditioning and heating are unavoidable energy sinks. The quicker an interior reaches comfort temperature, the sooner you can adopt a gentle driving style that favours economy. The M135i’s HVAC system is effective; a properly warmed cabin reduces the temptation to blast the heater and rev the engine to ‘feel warm’. For winter eco runs, plan stops and routes that let the engine reach operating temperature efficiently — short, cold city hops are the worst foe of fuel economy regardless of the car.

Noise, vibration & refinement — the hidden fuel cost

Noisy cabins prompt higher inputs. If you can’t hear the tyres or the engine’s subtle load changes, you tend to overcompensate with throttle or steering corrections. The M135i is not a cocooned luxury saloon; it delivers engine and road noise more directly. As a former racer, I love that connection — it lets you drive more precisely — but for a relaxed eco run it demands more attention. Keep tyre pressures up and choose quieter rubber and you’ll reduce both noise and rolling resistance.

Technology that helps save fuel

The menus and trip computer are your best allies. Use the instantaneous economy readout to train your right foot: you’ll feel when the turbo starts to pull and when it’s efficient to stay off-throttle and let momentum do the work. The M135i’s broad torque curve allows steady, higher-gear cruising which is very friendly to fuel consumption when driven intelligently.

Route selection — pick roads that reward momentum

For an eco-adventure the route itself matters more than a few MPG on paper. Twisty B-roads let you maintain momentum between corners if you approach them with an economy-first mindset — steady braking, tight lines, carrying corner exit speed rather than accelerating hard mid-corner. This is where the M135i shines: its chassis lets you carry speed with less throttle, so you can be quick and economical at the same time. Conversely, stop-start urban routes and short motorway stints are where the car will consume most. If fuel efficiency is the goal, plan longer legs at steady speeds where the straight-six runs at low load in a high gear.

Tyres, wheels and fitments — small changes, measurable gains

Fit narrower, low-rolling-resistance tyres if the trip prioritises economy over lap times. The M135i’s handling will soften slightly but the straight-six’s torque means you don’t need excessive mechanical grip to feel brisk in normal driving. Lightweight wheels reduce rotational inertia and improve real-world economy on routes with lots of speed changes. These are practical, reversible changes that don’t take away the character of the car.

Practical tips from a former racer for eco driving in an M135i

1. Use the instrument readouts to learn which gears and rev ranges deliver best economy for your fuel/tyre combination.
2. Plan routes that favour momentum: longer A-road sections are usually kinder to the fuel needle than repeated town-centre crawling.
3. Keep tyre pressures at the higher end of the recommended range for improved rolling resistance, but don’t exceed load limits.
4. Avoid roofboxes and external racks unless essential — the aerodynamic penalty outweighs any practical gain for eco runs.
5. Lighten the load: strip unnecessary luggage, and remove heavy items from the boot when not needed.
6. When possible, use cruise control on steady-speed sections; it removes human tendency to over-accelerate and decelerate.

Where the M135i hits the mark — and where it doesn’t

Hits: driver engagement that lets you be efficient without feeling boring; clear trip data and ergonomics that lend themselves to learned economy; compact packaging that’s lighter than many crossovers and therefore inherently more efficient for the performance it delivers.

Misses: the performance-focused interior and chassis mean the car encourages brisk inputs — that’s a blessing and a curse. Noise and firm seats can push a driver to compensate with throttle or to turn up HVAC settings, which eats fuel. Technologically, the M135i predates some of the later, seamless smartphone and eco-route integration that make modern economy driving marginally easier.

Final thoughts — an eco-adventure in a performance hatch

I don’t expect the M135i to pretend it’s a Prius, nor should it. What it offers is a compelling compromise: performance that can be coaxed into efficiency, and an interior layout that rewards considered, precision driving. On an eco-minded route chosen to exploit the car’s strengths — flowing B-roads, a sensible cruise on the motorway and minimal city stalling — you can enjoy the M135i as a genuine eco-adventurer. You’ll be faster than most, happier behind the wheel, and if you use the instrument data and a little discipline, you won’t necessarily be much worse off at the pumps than many of its sportier rivals.

In short: the BMW M135i’s interior and technology are tools. If you wield them with the patience and discipline of a racer turned economical road driver, you’ll get a unique blend of pace and thrift. Ignore that nuance, and the car will happily remind you why it’s an M-badged machine.