...mpg) is killing me. Is that normal ? In order to get the very best mileage, I don't drive faster than 65 oh the freeway, and I don't use the air conditioner. The Ridgeline is advertised at getting 21 mpg city. I eats like an 8 cyl big boy.

Wow... that's surprising.... my friends suburban gets better MPH than that (not by much). Yeah, go for the tune up and see if that helps....

It's a truck,what do you expect?

do a tune up...if that doesn't fix that then take it in. your warrenty should still be good....if they're advertising correctly. perhaps the type of gas and the place where you're getting it at?