Fuel Economy Update for December - Achieving Combined MPG Requires the Improbable - 2015 BMW M235i Convertible Long-Term Road Test

2015 BMW M235i Convertible Long-Term Road Test

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2015 BMW M235i: Fuel Economy Update for December - Achieving Combined MPG Requires the Improbable

by Jason Kavanagh, Engineering Editor on January 11, 2016

2015 BMW M235i

Our long-term 2015 BMW M235i continues to win us over with its lusty, turbocharged silken propulsion device. It begs the driver to open the taps and twist the tach needle to the five-o'clock region of its gauge.

As we've indicated before, such behavior satisfies in the moment (and warms the soul) but doesn't do fuel economy any favors. In December, our M235i managed 19.5 mpg over 1,032 miles, bringing its rolling lifetime fuel economy to 20.9 mpg. This is in line with its EPA city rating of 21 mpg.

So what would it take for us to bring our M235i's lifetime fuel economy up to the sticker's 25 mpg combined rating? Glad you asked. Let's assume that, from this point on, we consistently achieved our best observed single-fill fuel economy of 29.7 mpg for the rest of the car's time with us. We'd have to drive it in that sissy-pants manner for the next 15,000 miles. Then we'd hit 25 mpg observed.  

Yeah, that just ain't gonna happen in this rig.

Jason Kavanagh, Engineering Editor @ 12,984 miles

Worst Fill MPG: 12.5
Best Fill MPG: 29.7
Average Lifetime MPG: 20.9 
EPA MPG Rating: 25 Combined (21 City/ 32 Highway)
Best Range: 331.9 miles  
Current Odometer: 12,984 miles

Note: Cars are sometimes refueled before their fuel tanks are nearly empty. As such, "best" and "worst" fuel economy entries above are not necessarily the result of an entire tank's worth of driving.

  • Full Review
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  • Long-Term

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