Why is there an 80l and 100l gas tank? The owners manual, to my memory, siad the S has the 80l and the 4S and Turbe has the 100l. Why the difference?

Cheers, JohnnyB

 

As in so many things Porsche manages to get a few extra $s. In the 2011 P and P4 models the 100l tank is available as a $400 option.

 

To extend the range on a vehicle which has less fuel economy and ones that are likely to be driven with less emphasis on economy.

The mileage estimates are a formal evaluation with a given percentage of gasoline in the fuel tank. The economical models, with less gas and thus less weight, get an even better fuel economy rating.

For the other models, where fuel economy is less important, the priority is range.

 

this doesn't make sense from Porsche.

for cars with the 80L, where does the extra 20L space goes to? just dead space?

cars with good economy can also benefit from extra range, rather than having 20L of dead space somewhere in their cars.

 

It makes perfect sense to me. Read the second paragraph again.

If the FORMAL MPG quoted on the window sticker (the amount you get credit for when your CAFE is figured) is based on an official test with one half a tank of gasoline and the whole car and gas weighs a given amount you may or may not be fined with a gas guzzler tax or credited with an average MPG that doesn't screw your corporate average. This is important with mileage being mandated by the government. In fact, one half of one mile per gallon is worth pursuing. The Boxsters and Caymens are more economical still and if you'll notice, they have small gasoline tanks as well. Rumors say that four-cylinder engines may be introduced in these models soon to help bring down the corporate average. And their gas tanks may also be reduced in size.

Until those laws are fully enacted and enforced, you have the option of choosing your priority, which may be extended range but at an increased price. The extra room would show up as slightly more ground clearance or less crowding around the tank.

 

^OK jmm, thanks.

 

i have a question, i just bought a used 2010 Panamera 3.6 lit petrol. it comes with fuel tank of 80 lit, can i increase the tank size to be replaced to a 100 lit or even 120 lit size? if there is a manufacturer for that size? if yes, can you advise how i can contact the manufacturer to check price n place order

 

don't know whether it would be worth the hassle or the expense to gain 100 miles range, imho. To me, 400 + miles on a tank is about all I'd want to drive at a time....even in a comfy Panamera!