AS part of a series of new sections covering the remarketing industry, Fleet News is looking at how new cars you take on to your fleet might perform over the next three years.

Using data from used car expert CAP Motor Research, we will benchmark two cars against each other to see how they both perform over three years/60,000 miles, listing how each car's value performs at key mileages and dates during its life. This week, we compare petrol and diesel in the shape of the Vauxhall Astra.

Vauxhall Astra 1.8i 16v SRi 5dr

Price new £15,195

Mileage	Age (mths)	Predicted value	Money lost
20,000	12	£8,925/60%	£6,270
30,000	18	£7,750/52%	£7,445
40,000	24	£6,725/45%	£8,470
50,000	30	£5,850/39%	£9,395
60,000	36	£5,100/34%	£10,095

(Source: CAP Motor Research)

Vauxhall Astra 1.7 CDTi 16v SRi 100

Price new £16,095

Mileage	Age (mths)	Predicted value	Money lost
20,000	12	£10,025/63%	£6,070
30,000	18	£8,525/53%	£7,575
40,000	24	£7,275/46%	£8,820
50,000	30	£6,260/39%	£9,835
60,000	36	£5,400/34%	£10,695

(Source: CAP Motor Research)