Bharggav Paranjape
•2dI was planning to buy the Honda Amaze CVT earlier, but due to uncertainty around a higher percentage of ethanol blending, I have decided to go with the Tata Altroz diesel. But now I read that the government is also planning to blend isobutanol in diesel. Should I buy a diesel vehicle or not? Will isobutanol adversely affect diesel engines and affect fuel economy?

Autocar India
There is no reason to avoid either a petrol or a diesel car purely because of future fuel-blending plans.
Just as modern petrol cars are being engineered to handle higher ethanol blends, any future diesel blend regulations will be accompanied by corresponding changes from vehicle manufacturers. If isobutanol blending is introduced, it will be done in a controlled manner, and vehicles sold in the market will be calibrated accordingly. There is currently no evidence to suggest that such blends would cause adverse effects on modern diesel engines when used within the prescribed limits.
The more important question is whether a diesel suits your usage pattern. If your running is high and includes regular highway trips, the Altroz Diesel remains a compelling option. However, if your usage is predominantly urban, the Honda Amaze CVT is still the more sensible choice. It offers a smoother driving experience, lower complexity and none of the DPF-related concerns associated with modern diesel engines.

Tata Altroz
Explore cars mentioned
More questions on similar cars
Curated collections
Popular discussions right now
Posted on: 14 Jun 2026
Need expert advice?
Ask the Autocar community and experts.







