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<blockquote data-quote="cranky" data-source="post: 1336009" data-attributes="member: 9160"><p>^^Depends totally on driving style. I averaged about 100km/h in ghat sections around Mumbai, using a tiny little Opel Corsa. On flats it was closer to 120. This is not top speed, but door-to-door average with very early starts.</p><p></p><p>Diesel starts struggling very quickly at higher altitudes due to the higher freezing point of the fuel. It thickens and the engine efficiency drops off rapidly. Which is why almost all diesels have a preheater to warm up the fuel in cold conditions when required. Petrols grow asthmatic due to the thinner air, but modern ECUs compensate for this quite efficiently. I've never experienced a loss of power significant enough to require a change in driving style.</p><p></p><p>Diesel scores very high on moving high amounts of load at low rpm (which is a measure of torque). Overall a diesel engine is much easier to tailor for low-end grunt, whereas a top-end screamer is easier to do with petrol due to the higher power index of the fuel itself. </p><p></p><p>OTOH there are notable exceptions. The Alto is a dog of a petrol engine, and for a long time the fastest racer in the Le Mans 24H was a 'diesel' - the Audio R10 TDI.</p><p></p><p>In general however, as the revs climb petrols earn their living much better, the wider power band helps a lot in most driving situations. Diesels are a one-trick pony, the trick is a fantastic one but nonetheless they're generally a little more limited due to the heavier fuel (takes more effort to burn it).</p></blockquote><p></p>
[QUOTE="cranky, post: 1336009, member: 9160"] ^^Depends totally on driving style. I averaged about 100km/h in ghat sections around Mumbai, using a tiny little Opel Corsa. On flats it was closer to 120. This is not top speed, but door-to-door average with very early starts. Diesel starts struggling very quickly at higher altitudes due to the higher freezing point of the fuel. It thickens and the engine efficiency drops off rapidly. Which is why almost all diesels have a preheater to warm up the fuel in cold conditions when required. Petrols grow asthmatic due to the thinner air, but modern ECUs compensate for this quite efficiently. I've never experienced a loss of power significant enough to require a change in driving style. Diesel scores very high on moving high amounts of load at low rpm (which is a measure of torque). Overall a diesel engine is much easier to tailor for low-end grunt, whereas a top-end screamer is easier to do with petrol due to the higher power index of the fuel itself. OTOH there are notable exceptions. The Alto is a dog of a petrol engine, and for a long time the fastest racer in the Le Mans 24H was a 'diesel' - the Audio R10 TDI. In general however, as the revs climb petrols earn their living much better, the wider power band helps a lot in most driving situations. Diesels are a one-trick pony, the trick is a fantastic one but nonetheless they're generally a little more limited due to the heavier fuel (takes more effort to burn it). [/QUOTE]
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