Is this true about fuel pumps?

[Mr 5 0]

The stock FP is rated at 88 lph.

Yes, the capacity of the pump - no matter how huge - doesn't determine your mpg; the engine components - and how you drive the car - does that.

By the same token, a bigger FP won't help you go any faster if the engine remains exactly the same after the pump install as it was before. You'll just have a bigger capacity FP, which is a good thing, especially if plan future mods.