I wouldn't bother, you'll contaminate your bowser for a start. Sand and sugar won't do shit, it'll settle out in their fuel cans, you'll still have it in the bowser. Petrol and adblue (ad-blyat) smell, so they'll possibly realise and burn your site down or whatever. The risk exceeds the reward for any kinda additive shenanigans, just catch the pricks in person or on camera and make it not worth their while.
Fuck I hate crackheads, shouldn't have to live like this
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