What size diesel car is equivalent to 1.6 litre petrol?

Always had 1.6 petrol car, now thinking of going diesel for first time, trade in of my car amount 1500e 00 car,looking to spend no more than 8k cash along with that
But trying to figure out when does it stop been worthwhile getting the diesel, ie is 1.6 petrol is similar to 1.9 diesel for efficency, tax,petrol,insurance,tax, looking to by an estate car that has 6/7 seats(fold up)

If you always had 1.6 petrol then any decent diesel will seem quick in comparison.

For 9 grand you should be able to get a decent esate or MPV.

Depends what you want / need.

1.9 diesel will be easier on juice.
tax isn't much higher on a 1.9
insurance should be similiar enough.

I had a 130 bhp passat 6 speed for 4 years and loved it. Sis is driving it now and it is still going strong with 117k miles on the clock.

You should find an 05 estate old shape for your budget
Look for a sport or highline only mind, avoid poverty specs.

Sorry, can't really help with your original question but, one thing is for sure, once you've driven a diesel for a bit you'll wonder why you spent all that time pfaffing around with petrol cars.