Hi DK
The savings you would make on your http://www.homeapproved.co.uk/calculating-motor-premiums.htm (Motor Premiums) for choosing a diesel engine over petrol would be negligable. As a young driver you need to be aware of some fo the main factors which can lower you premium considerably:
Choose Your Car Wisely (Ref. Car Insurance Groups).
Look after your Vehicle (keep your car on your driveway rather than in the street, and a much better one if it is locked away in a garage overnight).
Limit The Drivers
Select The Appropriate Cover (Third Party or Fully Comprehensive)
Pay The First Part Of The Claim
Protect Your No Claims Discount
Look For 'Free' Insurance (Available on new car purchases)
Look for Introductory Discounts
Add Security
Last but by no means least (see above!) - Shop Around!
Hope this is of some use.
>> Stay informed about: Diesel insurance at 17 years old?