I put in the most optimistic numbers. It's a hybrid, so I upped the efficency of engine. It most likely goes into atkinson cycle. Also, my front engine RWD truck is is more efficent than .85. with lock up torque convertors.
TL/DR
Just saying he not getting 45 mpg using the most optmistic numbers. which is what you're saying also.
Quote:
Originally Posted by Autobahnschleicher
Drivetrain efficiency of 95% is REALY optimistic for a front engine RWD automatic vehicle.
85-90% is more realistic.
With realistic values for drivetrain (0.85) and engine (0.22) efficiency as well as rolling resistance (0.010), I'm looking at about 20 mpg at 60 mph/100 km/h.
If I reduce the CD to 0.25, wich would mean a lot of aerodynamic modifications, we're looking at about 24 mpg.
Only when you're going full Basjoos and drop your CD to 0.17, you're getting close to 30 mpg but that's before factoring in the reduced engine efficiency at low power(17-26 hp).
Gasoiline V8s aren't exactly great at that.
TL/DR
You won't average 40 mpg at 60 mph with that car unless you go to the extremes.
|