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Old 09-30-2007, 02:34 PM   #1
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70 mpg 2007 opel corsa 1.3l diesel

my car is still out of commission but fortunately i have a week off from work this week. last week i drove a replacement car from the garage and so was able to compare a 2007 car to a 1987 car under the same circomstances for one week.

when i got the car the tank was nearly empty. the needle possitioned at the beginning of the red area. so i put in about 8 liters of diesel.

i wasn't to impressed by the car itself though. the model has grown from something positioned below my kadett to a car of almost identical dimentions, though rear seating and trunk space was slightly less and i still considder my car more practial. powered steering felt rather uncomfortable at first. It took less effort taking a roundabout at speed or parking, yet while cruising it felt heavy and uncommunicative. handling roadholding and breaks where fine and definately better than my car, although it felt like this car would not let one know when the limit was finally reached, something my car definately does wich makes one not want to puch it to far.one could say with my kadett we communicate back and forth about what's going to happen, while with the corsa it just does what it's tolled... no questions asked. i'm sure it's much safer in the end but it makes driving it rather dull. that again it got me to work wich is what all this driving was really about.

the worsed thing about the corsa where the dead angles. the inclind winshield is framed by two solid looking pillars that are constantly blocking vision when taking turns or comming onto main roads. also the B pillars are right in your face when looking behind you... something the 3 door version of this car might not have. one could argue the inclind windshield pays of in aerodynamics but the Cd of this car is about the same as that of mine and it's got a bit more frontal area so in the end drag might be worse. while some problems are annoying or uncomfortable i considder poor forward visibility to be dangerous and no ammount of redured drag will make up for it.

the car came with a tachometer wich i considder something very usefull and i will probably try to install on my car now.
i found it's more usefull to be able to see where you are on the engines power curve than how fast you are going... the 5th grear was a nice feature to and will be badly missed if i get my 4 speed back. shifting up early enabled me to keep the engine between 1000 and 2000 rmp most of the times exept at very high speeds or when pulling up (wich went pretty well).

still by the end of the week i was not impressed by 20 years of automotive evolution untill i saw the milage... autch

i'd drivven 240 km and the fuel gauge was back at the red.... thats 240 km with 8L making for 3.33L/100 km or 70.63mpg
without EOC, aeromods, or even shutting the engine off at redlights. i know these figures are by no means exact and i could be quite a bit off, but it's fair to assume that when driven with FE in mind this car is capable of some serious hypermiling.

i found the overall concept of the car to be something of a disapointment, but i'm uttery impressed with the milage although i didn't have the chance to evaluate it proppery.

finally opel as build a prototype of this car as a mild hybrid. wich i'm sure has an even better milage.
i believe people should spend much more attention to their shifting and shifting up early and keeping the revvs down as much as possible can yield spectacular results.

i don't have a picture of the car i drove but there's a red one, the one i drove was grey
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Old 09-30-2007, 04:23 PM   #2
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Small diesels use about .05-.1gph idling, so engine off isn't nearly as big of gain compared a gasser.
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I think if i could get that type of FE i would have no problem driving a dildo shaped car.
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Old 09-30-2007, 06:46 PM   #3
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Plus switching turbocharged engines on and off a lot is bad for turbocharger bearing wear.
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Old 09-30-2007, 09:19 PM   #4
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Above reminded me of the topgear video where Jeremy talks of how the Ferarri he was driving never gave you a clue of the impending doom of driving a car so fast that handled so well... because it brings you right up to the envelope without so much as a hint that pushing it any further will send the car into chaos and loss of control.
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Old 10-01-2007, 07:56 AM   #5
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Another comment: with respect, I think the method used for measuring fuel economy on this top-up was highly inaccurate....the fuel economy was probably not what was measured (somewhat worse, I suspect)..
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Old 10-09-2007, 03:33 PM   #6
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Quote:
Another comment: with respect, I think the method used for measuring fuel economy on this top-up was highly inaccurate....the fuel economy was probably not what was measured (somewhat worse, I suspect)..
sure this was by no means scientiffic. but it was the best guess i could make given the time and info available. i didn't really bother about FE other than drive as usual untill a saw the fuel needle was back where it started and than calculated the FE. and was rather surprised at the good result
i just looked up the official FE numbers on the opel site
and they are
city
5.7l/100km - 41 mpg
outside city
(it doesn't say highway so i don't know what speed is used for this figure) 3.8l/100km - 62 mpg
combined
4.5l/100km - 52 mpg

since i better factory highway FE numbers in a 20 year old car with a 4 speed petrol engine on the same route by at least 4mpg , i imagine i'd at least do the same in a modern diesel with a 5 speed. by wich i don't mean to say that i'm such a great hypermiler wich i'm obviously not but that i totally believe that with the right driving style this engine is capable of approaching if not exeeding 70 mpg easily.

anyway, the bottom line is that i've got quite some respect for moddern diesels now.
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