JHZR2
Staff member
Speed is even more of an issue with these monster vehicles with horrible aerodynamics.My Mazda 6 has a non-turbo 2.5L engine and I’m getting an average of slightly over 35mpg with a mix of rural and highway driving. Speed is only part of the answer. I‘m being punished indirectly by way of restricted future vehicle choices because someone wants to use their F350 as a daily driver. When half the vehicles on the road have V8 engines and aren’t legally classified as ‘cars’ then that’s not something that slowing down can fix.
The knobs you have to turn are speed and combustion efficiency.
The ideal is reasonably lower speed with maximum combustion efficiency.
Some engines are more efficient at higher loads. But the fallacy of this is that you don’t want more load in order to achieve higher combustion efficiency. You want max efficiency at lower load. To get this the lower lid has to be achieved with lower speed and a lower rated engine.
Probably 55 mph aerodynamic cars with 70hp or so engines would be about right. Maybe not fun, but for most people moving, about the best efficiency.
This is why the variable displacement, and hybridization (which is effectively electrical variable displacement), and turbocharging are the answers.
Actually, phev is the answer imo.