Same here. PT boats are but never understood why rest of GVs weren't. Next we need to look at fuel consumption...
Fuel consumption, speeds, and reload rates.
Fuel consumption is hard to gauge. If the range of a tank is 150 miles (on road, and everything in gv-land is rated "on road"), then with the current AH setting it will have at worst a %75 max fuel (4+ fuel tanks destroyed at spawn base), so that makes for a 112 miles range. At most, tanks travel 3-5 miles from spawn point to the enemy target (base, town, spawn point). So... how is that issue tackled? It makes easy sense as to why HTC chose to not even bother with that aspect of gv's.
Currently in AH, all of the gv's have their rated road speed available. Most of us know that the T34 didnt go rumbling across the plains and woodlands of the Eastern Front at full throttle at 35 mph. As we have it in AH, the speeds are a luxury. We dont have to worry about throwing a tread, plowing into a berm or a 2ft thick tree, or giving our crew members a concussion from the rough terrain [right about here someone is thinking about the wee little shrub that flipped their Tiger]. But all in all, speeds are a Jeckyl and Hyde situation. If we campaign for slower and more accurate speeds for off road terrain, then we slow everything down.
Reload rates have been a source of constant debate. Im not sure exactly what to suggest a change in other that the M4A3/76mm. It has the same reload rate of the lighter and shorter 75mm round and also the smaller and more compact 75mm cannon. There are a few other debatable reload rates as well, but none like the 76mm M4.