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转自 Automotive Gossip

And so this age old debate continues…but which one of these fuels really does reign supreme at the pumps? Let’s take it in turn to discuss both the pros and cons of each one.

In the blue corner: Weighing in at an average 95.9p/ltr, the petrol engine packs quite the punch. The most popular (some may argue most common) option for motorists, cars with petrol engines are more much quieter and faster than its main opponent. Petrol engines are much lighter therefore offering a much more responsive drive, on the whole. At the forecourts, motorists with petrol engines have an option of unleaded or super-unleaded fuel. The difference between both is their Research Octane Rating (RON), which rates performance levels. Unleaded and Super-Unleaded have RON of 95 and 98 respectively, which indicates that super-unleaded petrol hold a higher performance than unleaded (the higher the RON the better performance). Petrol engines are much more easily repaired and require fewer services. Nonetheless, with an average petrol car emitting approx 214g/km of CO2, petrol engines are less friendly to the environment. Although with an increase in customers looking for more environmentally friendly cars, Seat have introduced Seat Ibiza 1.2 with low CO2 emissions, and an average of 47.9mpg, petrol cars are becoming more aware of the importance of being environmentally friendly.

In the red corner: Weighing in at an average 109.3p/ltr, the diesel engine is an underdog in the fuel stakes. But none the less is becoming an increasingly popular choice among motorists. Diesel engines are well renowned for being much more environmentally friendly with a lower CO2 emission rate, with an average diesel vehicle emitting 196g/km of CO2. Diesel engines are on the whole heavier than petrol, however this comes with a distinct advantage as diesel engines have more torque. Which in turn means that they are much better performers for pulling or travelling up hill. For motorists travelling long distances, diesel engines (although costing more p/ltr at the pumps) are much more effective as, the more miles travelled the better the value of the fuel the motorist receives, take Renault with their Megane Expression which gives efficient fuel consumption with an average 64 mpg. Other benefits of having a diesel powered vehicle are that the motorist pays less tax compared to its petrol counterparts.

So there we have it, in a nutshell, diesel cars are more costly to buy, and more costly in upkeep, nevertheless, they have less depreciation and hold their value very well in re-sell. Petrol cars on the other hand are cheaper to buy and even cheaper to run, however with high emission rates petrol cars are less environmentally friendly. Choosing which engine you want depends solely on the purpose you your vehicle. Looking to travel the length and breadth of the country? Then a diesel engine may be better suited to you. Looking for a nippy little cost effective run around? Perhaps you’ll be more in favour of a petrol engine instead.

Both fuel types have their benefits and drawbacks. To say which one takes the crown in the fuel stakes is in turn impossible to conclude. Settling this debate is as hard as choosing which action hero is better…

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