2018 BMW 640i Convertible

Compact Sedan Premium
BMW 640i Convertible 2018
23MPG Combined
1 Trim
← 2017 2018
Updated February 27, 2026

The 2018 BMW 640i Convertible is a Compact Sedan that delivers 23 combined MPG. Here’s everything you need to know about this vehicle, from fuel economy to safety ratings.

2018 BMW 640i Convertible Specifications

SpecValue
Combined MPG23 combined MPG
City MPG20
Highway MPG29
Body StyleCompact Sedan
Fuel TypePremium
DriveRWD
Available Trims1

Annual Fuel Cost

Based on EPA estimates, the 2018 BMW 640i Convertible costs approximately $2,550 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

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