To All, Read Carefully:
To make some qualifications, I have 40 years of automotive electronic experience and hold a current Ham Radio License with the FCC to date.

How does your late model care run? By computer controlled commands. These commands can be changed by re-programming.

Ever take a trade and exit successfully? Go back and try to find the trade on a 5 minute chart. You'll find it, but not how looked at it when you entered and exited. Repainting. Your computer cannot remember EVERY byte.

Every new Build: Brokers say well, the Polish language is a new addition. Traders say too much CPU usage, or my EA doesn't work. Reason: Because the computer programmers for the brokers are instructed to increase, decrease, or smooth feeds. In other words, your computer is only going to know what it is told.

End of the day, Friday. Most all Brokers will wind up with the same ending price on the pair you are trading, within a few pips, depending on server time.

I've measured candles at the exact time with 2 different Brokers with the same server time. DIFFERENT. Evidence of feed tampering.

Answer: Brokers can fool with the feed, but not with price on large moves.
Until Traders find programs to defeat Broker feeds, we are stuck. Whenever I trade, I make sure that the price is standing still. I trade the GBP/JPY. On a moving candle, on a 7 pip spread, I have been put into the trade as much as 18 pips. Ever notice they never requote on an Market Entry? Only on Exit.

And notice, the NFA doesn't address this legal thievery. That why the disclaimer: Trade at your own risk.

Signed: Been scammed all my life, and can spot them in a minute.

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Not Everything that looks straight is: Until you measure it.