If you remove your worst tanks, then you should also remove your best (downhill w/ tailwind). The only tank I haven't entered was when testing my mods: I filled up before and after to make sure it didn't effect any other tanks. I think that was OK to omit since it was
scientific research for better fe 
But to be fair, that tank is included in my private spreadsheet log on my computer.
All other tanks are included, even the worst ones with snowchains, or hauling cargo, or whatever etc.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread