General Car Conversation
07-27-22, 12:32 PM
#1081
Lexus Fanatic
this is the only one I can think of
Last edited by Toys4RJill; 07-27-22 at 12:37 PM.
07-27-22, 12:38 PM
#1082
Lexus Champion
When I'd check the tank average sometimes it would be in the high 16s. LS430 I can get mid to high 17 MPGs in the city.
I don't really trust EPA for real world. Remember I also get 3 more on the highway than rated with the truck.
07-27-22, 12:41 PM
#1083
A smaller engine absolutely can be beaten by a bigger engine if you require a load that's beyond the smaller engine's sweet spot, if the smaller engine has to stay heavily throttled at high RPM due to gearing (*cough* 2IS350 *cough*) and so on.
Cylinder count doesn't matter.
07-27-22, 12:43 PM
#1084
Perhaps you can share BSFC figures to back that claim?
Just tested:
Grade: 22.7%
Altitude: 732m min, 749m max
Distance: 3.644km
GPS Speed: 149km/h constant (cruise control), ~92.5mph
RPM: 2187rpm (avg), 2510rpm (max)
Power: 54.13kw (avg), 63.46kw (max)
No SoC change (read: no power going out of the battery). Outside temp 29C, AC set to 24.
4000rpm is around 125kw sustained power output. This car does not generally see >2000rpm during steady state cruising on the highway, unless traffic allows for such speed and I'm in the hilly section.
Aerodynamics:
https://www.automobile-catalog.com/c...i_quattro.html
https://www.automobile-catalog.com/c...s_gs_450h.html
both claimed 0.27 cd/m2, slightly larger cross section on the A8.
Still not convinced that any such car does 29mpg (~8.11l/km) at 90mph (~145kph).
Just tested:
Grade: 22.7%
Altitude: 732m min, 749m max
Distance: 3.644km
GPS Speed: 149km/h constant (cruise control), ~92.5mph
RPM: 2187rpm (avg), 2510rpm (max)
Power: 54.13kw (avg), 63.46kw (max)
No SoC change (read: no power going out of the battery). Outside temp 29C, AC set to 24.
4000rpm is around 125kw sustained power output. This car does not generally see >2000rpm during steady state cruising on the highway, unless traffic allows for such speed and I'm in the hilly section.
Aerodynamics:
https://www.automobile-catalog.com/c...i_quattro.html
https://www.automobile-catalog.com/c...s_gs_450h.html
both claimed 0.27 cd/m2, slightly larger cross section on the A8.
Still not convinced that any such car does 29mpg (~8.11l/km) at 90mph (~145kph).
07-27-22, 12:49 PM
#1086
Lexus Fanatic
100%. but, we are talking apple to apples, not an SUV vs heavier sedan (very rare for a Lexus sedan to be heavier than a Lexus SUV GX/LX) ... we are talking Lexus larger engines vs smaller engines. There is no EPA data that I am aware of that would support/demonstrate this.
Last edited by Toys4RJill; 07-27-22 at 12:52 PM.
07-27-22, 12:51 PM
#1087
Lexus Test Driver
Vehicle weight doesn't matter anywhere near as much as drag at high speeds.
Engine tuning is exactly what I described with the fuel per work measurement. https://en.wikipedia.org/wiki/Brake-...el_consumption
Engine tuning is exactly what I described with the fuel per work measurement. https://en.wikipedia.org/wiki/Brake-...el_consumption
Checked out the link and good stuff there.
Noticed the equation suggests it's all about the Torque.
I'm guesing that would all depend on the car and what speed and gearing they have to achieve max torque and efficiency.
Here's the equation from the link.
There's OP.
Approx what you get.
Guessing the S560 is a 5.6L
07-27-22, 01:06 PM
#1090
Lexus Test Driver
What they like to drive in Belgium aka whats popular and what cars people want?
Thank you ATJ.
It used to be easy to see what's under a hood.
Duh my RX330 is a 3.3L, oh the good days.
I bet a 4.0L twin turbo does scream, sounds like fun.
07-27-22, 01:38 PM
#1091
Lexus Champion
Check out how fast an SUV's fuel consumption climbs at speeds above 60mph. At 80+ they can easily be matched or beaten by a heavier sedan.
A smaller engine absolutely can be beaten by a bigger engine if you require a load that's beyond the smaller engine's sweet spot, if the smaller engine has to stay heavily throttled at high RPM due to gearing (*cough* 2IS350 *cough*) and so on.
Cylinder count doesn't matter.
A smaller engine absolutely can be beaten by a bigger engine if you require a load that's beyond the smaller engine's sweet spot, if the smaller engine has to stay heavily throttled at high RPM due to gearing (*cough* 2IS350 *cough*) and so on.
Cylinder count doesn't matter.
07-27-22, 02:09 PM
#1092
Lexus Champion
They 1000% are at 70+. No comparison since the rest of the car is so much better in terms of overall system efficiency. Remember, I also own a 07 ES350.....it can't come close
07-27-22, 02:11 PM
#1094
Lexus Champion
Check out how fast an SUV's fuel consumption climbs at speeds above 60mph. At 80+ they can easily be matched or beaten by a heavier sedan.
A smaller engine absolutely can be beaten by a bigger engine if you require a load that's beyond the smaller engine's sweet spot, if the smaller engine has to stay heavily throttled at high RPM due to gearing (*cough* 2IS350 *cough*) and so on.
Cylinder count doesn't matter.
A smaller engine absolutely can be beaten by a bigger engine if you require a load that's beyond the smaller engine's sweet spot, if the smaller engine has to stay heavily throttled at high RPM due to gearing (*cough* 2IS350 *cough*) and so on.
Cylinder count doesn't matter.
07-27-22, 02:12 PM
#1095
Lexus Champion
I have a GS460, before I lowered it, change the wheels (bigger and wider), changing the TCU and added front lip I was easily getting 30 mpg at 90 mph. I was blown away, because strangely at 75 mph it would only get 1 mpg better. After the mods I get around 24-25 mpg at 90 mph. Not sure what exactly has been the biggest factor for my reduced mileage, probably just a combination. I'm in florida though so roads are flat.