Test drove the F150 with the 2.7 engine and it took a few stops to get use to the start-stop feature. On that year you could just hit the tow haul switch and it was disabled and ran normally. Now that we have the hybrid car to tow behind the motorhome the start stop feature is not that weird feeling. The Ford system is fast and smooth operating. Have driven a proto type from a different builder and it had a thump type of feeling to it. Both had the new 10 speed auto in them. Both driven at a closed test site. Wish I could have hooked up a trailer and tried them out.