Regarding the differences between versions of the same car, it's possible that some variations may have different engines, transmissions, or other features that could affect fuel efficiency. However, as you noted, driving habits and conditions can also play a significant role in fuel economy, so it's important to consider how a particular version of a car might fit your individual needs and usage patterns.
Features like air conditioning and cruise control can contribute to a more comfortable and convenient driving experience, but they may also have some impact on fuel economy. Fuel efficiency technologies like VW's BlueMotion can help improve a car's fuel economy, but again, it's important to consider whether the added cost of these features is worth it to you.
To maximize your chances of achieving good fuel economy, consider looking for cars with smaller engines, efficient transmissions (such as automatic CVT or dual-clutch transmissions), and aerodynamic designs. Cars with hybrid or electric powertrains can also be very efficient, but they may have higher upfront costs.
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