Lexuses? Lexus’ ? Surely not Lexi. 
I’ve noticed, through casual observation, that the company cleverly avoids using the plural in ads and commercials by using phrases such as “Lexus vehicles”. Saying Lexuses aloud does sound awkward, so I can see why.
If you had two of the above mentioned vehicles and wanted to mention both in one statement, how would you do so?
Not that I have that problem. Traded them in on Audis. 
Peace,
mangeorge (Big BS’r)
“I have two cars. One’s a Lexus, and so is the other.”
Lexii
Just call them “Really expensive Corollas”.
Lexae
“Elvis”.
Lexu (pronounce “Lex-ooh”).
Lexusses’seszess.
Bert and Ernie.
Linux.
Lorax.
howabout…
a plural of mouse - mice
a plural of goose - geese
a plural of moose - meese? or mooses?
1 - Lexus
2 - Schmexus
3 - Vex us
Fancy-schmancy Toyotas
well, here’s a semi-educated answer.
In Latin, nouns ending in -us either have their plural as -i, or as -us (the same as the singular). My guess would be that the plural of Lexus would just be Lexus.
Thorax.
Lasix.
Lummox?
Lexicon?
Hell, I can’t even afford one Lexus. Why would I need to refer to two?
The plural of moose is moose.
Too dang much money.
About 80 grand worth of Toyota…