ZombiePhysicist· 2012 MP4-12C
You guys that never fill up for weight, I’m truly impressed. My sloth would never allow it, I always top off. Horses for courses I guess.Nah, not a massive waste of time. Usually 4-5 gallons is two weeks for me. And I know the times when Costco isn't busy (Sundays in UT, no line). I grocery shop twice a month anyways so it's a planned stop. An extra minute in a day twice a month does not make a difference to me.
I get better wear on the tires and lower rolling resistance as well as that 0.01 extra G. Plus finer integration over time of the price at the pump.
So if this was the car that you're producing, you would fuel it all the way and have 650 pounds of people in it, right? Then we can say the weight of the car is 3000 pounds and then massively overdeliver. Or why don't you do it like aircraft? Put a maximum vehicle weight, like 5000 pounds before the suspension can't appropriately function. Overly conservative values are nonsensical. GMA's weight statement is perfectly logical. You don't need to exceed or be below expectation because the weight of the vehicle is exact, and you get to decide how much fuel you want in it for whatever activity you're going to do (drag strip, daily usage, cross country GT, track, etc). If it would make you happy, I'm sure GMA could just list the car as 3800 pounds like an Aventador. Underpromise and overdeliver, right?
If you're trying to compare different vehicles and one car has a 13 gallon tank, and another has a 21 gallon tank, and the weight of the fuel is the difference maker, which is the lighter car? I'd say the one that could do combined cycle 200 miles of range and whatever weight that car happens to be at with that amount of fuel. This way, you can directly compare vehicles of different classes too (which is what you would want as a governing body for standardization).
I guess I could be fine with curb being everything but fuel, if everyone standardized on it. Or even a standard amount of fuel might be better, 10 to 15 gallons say.
But, what about the penalty for the extra weight for the extra material for the tank? 21 gallons isn’t that big. I think my tank is around 18 gallons. The 3 gallon penalty is not that great Really, but I see fair arguments for different solutions.
But the empty tank weight just seems unsatisfying, and I would argue unrealistic for most. Maybe the best solution would be just to standardize on say 12 Gallons of fuel and all other fluids topped off (and yes, tough luck we will penalize you if you have a big windshield fluid reservoir because we will top that off For fear some of you may decide to fill the oil only 1/4 the way).