if I want to be safe I want to make one bet only using my $ 800/1000, I would do either one of these 2 options.
not both, just one time only on either one.
first safe bet would be to play 8 single streets with 125.00 $ on each, so 1k. BUT LEAVING OPEN THE LAST 4 STREETS THAT HIT. so you look to see what were the last numbers that hit and on which street they show.
then bet the other 8, that simple.
return from 1000 $= 500. doing it one time only then leave the casino.
2nd safest bet would be to play 10 streets instead of 8, and leave the last 2 single streets open . last 2 that just came, again betting that they would not hit that soon right after they hit.
the return is less on your 1000$. but 200 $ profit is not so bad for one play. then go home.
the key is to not over state your welcome and continued playing.
now if a player really has the bug to play more, I would just regress the bets to a minimum bet and keep on until you lose your 5/10 $ bets. so you still save a good profit.