Would your party see through Lyle Lanley's lies?

Yes but since it is an plot hook, we would roll with it anyway.
Maybe stealing all his money before he leaves with the plane.

Some would. Others have access to stuff that is better than what he promises (high magic/sci-fi settings). So they wouldn't pay enough attention to him to notice that he's lying.

Other parties come to mind:
- Dark Heresy. He's making claims that, if true, are heresy of some kind. Regular heresy if he's using the warp, tech-heresy if he's using science as he's not selling anything Ad-Mech approved. What we do then depends on if we have another investigation running. If we don't, we investigate him. If we do, he gets lucky and we just kill him.
- Mass Effect game. One of the party would believe him. They would ignore that medi-gel is much more effective than his promises. Then that PC would get us in a lot of trouble by stealing his supply.

>>50329892
No but they would out swindle him without realising that he was pulling a con to begin with.

um, he SAID he was on the level, of course he's telling the truth? He even gave Wiggum his can opener, why would a bad guy do something good?

>>50331937
Also he called Apu his friend, despite the fact they worship different religions.

There's no way he could be a bad guy.

>>50329892
They would fall for it easily.

But then they would hunt him down without mercy afterwards.

>>50332145
>>50331937

But what about the main road that's still cracked and broken?

>>50332359
Sorry anon, the mob has spoken

>>50332476
i lost it at bayonet