Is this a Joke?

I had a guy the other night that wanted me to GUARANTEE him that the rental car he picks up in Glasgow will get 60 miles to the gallon. I honestly had to try not to laugh! Then he got mad at me because I could not promise him that!
I wanted SO badly to tell him I did not personally engineer the car, but instead I just read him what the site says, xxx brand car OR SIMILAR, and read him the disclaimer.


He insists that our site has the avg mpg on the cars we rent, although I couldn't find that anywhere, for that airport nor for the car rental company. In my mind I'm thinking "Well Sir. I'd like to help you but my crystal ball is broken"



I honestly thought it was a joke!