The thing I like about the GRE is the possibility for manufactures to use one basic engine block for a number of racing series. But I don't like the idea of a mandatory configuration, like the proposed 1.6-litre L4T. Wouldn't be better to allow any engine configurations and limit the fuel-flow? The fuel-flow limits could be enforced by using fuel-flow meters.
http://www.autoindustry.co.uk/articles/ ... ntable.xml
Fuel-flow limits are not only an instrument to control the speeds, but to increase engine life span and find the right balance between Formula 1 and its feeder series too.
Ideally it should be like this:
1) Formula 1 and LMP1: 'medium' high fuel consumption and allowance of all wasted energy recovery systems (KERS, HERS, etc.)
2) Formula 2 and LMP2: fuel consumption equal to or slightly lower than Formula 1 and LMP1, but no wasted energy recovery systems.
3) Formula 3: low fuel consumption and no wasted energy recovery systems.