Quote:
Originally Posted by Flying Ace
Quote:
Originally Posted by BimmerMat135
Well i did consider that. For the regenative braking if your going downhill probably you will end up going uphill at some point so you don't really "Â*gainÂ*" energy. So let's imagine a scenario at a constant speed on the highway 70mph. If you want to have diesel like fuel economy you will need to compensate for the 25% disadvantage. So at 70mph you should need around 20kwh to maintain your speed in the X5 diesel and about 21kwh in the X5 40e(considering the heavier weight). So to keep fuel consumption at diesel level your ice will use 15kwh and you will use 6kwh from the battery. After 100 miles the battery(9.2kwh) will be dead. So therefore the ice will have to provide 21kwh and then your fuel consumption will be around 25-30% higher than the diesel X5. So for short trip on the highway maybe you can get diesel numbers but any long trip forget it.
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Compensate for 25% disadvantage? You're just making numbers up now. The fact is diesel SUVs are getting no more than 30 MPGs on the highway. Cayenne SEH owners are all reporting numbers north of 30 for highway driving.
http://www.fuelly.com/car/porsche/ca...otpedlr/341217
Your fuuzy math analysis is so flawed it's not even funny. |
As I said on short highway trip PHEV can get good number. As you seem to like fuelly you can compare X5 35i vs 35d generally in the high 11L/100kms vs low 9L/100kms for the diesel. There is your 25% disadvantage. For long highway trip there is no way a PHEV will get same numbers as a diesel.