——-^ This.

I wasn’t alive then but I did live in LA a decade ago and the air was clean. I know how bad it was wayyyy baxk then. What my position is is the ubiquitous use of cats and new unleaded fuel made the air cleaner then than just sapping half the horsepower out of big engines. It’s crazy how well cats work scrubbing emissions.The real reason people say “don’t warm up your car” is because it pollutes more bc the cats are cold. The powers that be want those cats doing their job asap and warming as quickly as possible.

Emission controls are necessary, just where do we draw the line is the problem. Who on this forum likes start/stop?

 

I don't mind start stop with the 48v system

 

I totally agree with that. Which is why modern cars have both cats and emission controls. As much as people hate emissions, they are necessary to keep pollution down. I've driven in a few cars without CATS btw, and the smell of un burnt gas can be pretty strong

 

it's the best version of stop/start i've experienced but it's just a bit too aggressive to activate... like if it just waited until you actually stopped before activating it'd be better, but instead the car can stumble when doing a standard rolling stop through a stop sign or in heavy traffic

 

If you have it in Sport mode it delays activating more.

Heavy traffic is the only time I turn it off.

 

That's more to save fuel, as idling wastes a lot of gas. When my IS350 was idling, it would say it's getting 2 mpg. When I was cruising it would be 22 to 26 mpg

 

I don't even have 48v and I usually leave my start stop enabled. Doesn't really bother me in the bimmer.

 

It should say zero MPG when its idling

 

^^ exactly Idling = 0 mpg.

 

Actually, you are right, I do remember it saying 0 mpg

 

Common rule of thumb is you burn a gallon an hour idling.

That seems decently accurate. I've been in my car idling (stuck parked idling in a terrible snow storm for 12 hours) and the way the fuel depleted, like I said... sounds somewhat accurate.

 

That's the penalty to living in a city, just not great places to be and very polluted.

 

My truck was catless for a while and as much as I loved the smell of E85 or 98 octane I caved in an installed race cats on the 3rd engine refresh/change. Ironically it's still cleaner than new since the requirements back the core trucks were a joke and the tiny single cat was half way down the body! New ones are right after the long tubes and has one per side, I also kept the EVAP system working as that allows fuel to sit very long without problems or pressure building up.

I miss the smell but I know I probably shouldn't have that stuff fill the garage on start.....ruined some of the sound too. Not as much header tick makes it out now nor idle chop


My cleanest car in terms of emissions is the D4 W12, aside from raw C02 it's crazy how little it emits. The turbo engine is worse due to oil burn and the LS460 starts ungodly rich due to no SAI

 

some of the benzes actually have a gallons per hour reading in the gauge cluster! on my parents 2019 C300 it would do about 0.20 gal/hour idling in P and 0.33 in D after the engine warmed up and the revs settled down

 

My Jetta can idle for about a week if I felt so inclined.....I swear I don't know how to accept the fact the fuel gauge works. Thing is trippy coming from cars where I think 20s is amazing mpg