Volvo likes to match up power outputs of it's cars, so the T4 petrol has the same 190 horsepower that the D4 diesel has. It's delivered in a different way with the petrol being much smoother and quieter and higher revving, with not quite as much mid range torque as the diesel but more top end shove. Fuel economy can't quite match that of the diesel at 42mpg whereas the 0-60 time of 8.7 seconds and the top speed of 130 mph are broadly similar. If you're a higher mileage user doing 15-20,000 miles a year then the improved economy of the diesel may serve you better but for average users doing 10-12k miles a year then the negative publicity regarding diesel has meant that petrol cars are generally a safer bet come resale time.
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