I finally got my chance to do the run down south and back, with some surprising results! (Incidentally, the last tank of 6 gallons went 19 MPG with about 30/70 city/hwy driving.)
- Fueled up at Chevron on Crown Valley in Mission Viejo
- Headed south toward Oceanside
- NO AIR CONDITIONING
- Cruise control set to 69mph (because I'm a child)
- Stopped in Carlsbad (since the traffic was light) at the 7-11 on Carlsbad Villiage Dr to use the restroom
- Miles at the half point: 36
- Computer reported MPG: 27.6
- Headed back north
- NO AIR CONDITIONING
- Cuising at 69mph (still a child)
- Fueled up at the same pump at Chevron
- Total miles: 72.1
- Computer reported MPG (this leg): 27.7
- Computer reported MPG (total trip): 27.8
- Actual calculated mileage
- Miles: 72.1
- Gallons: 2.851
- MPG: 25.29
So! It would appear that my RTL-E does NOT, in fact, have abysmal MPG! At least when it has a chance to stretch its legs on a mostly flat highway cruising at ~65-70mph. This test now makes me wonder:
- How much impact does the AC have on mileage? (Must be a bunch.)
- Does anyone know if the EPA ratings are done with AC or without?
- Are the hills around my home really messing with my mileage? (The hills are aliiiiive with the sound of gaaaaas puuuuumps.)
- Do I live in an area that is nowhere near the conditions of an EPA rating test? (Almost certainly.)
- Do I need to take some occasional long-stretch trips to be sure my RL isn't suffering from short-trip-itis? (Probably, and that's fine with me!)
- Why is the computer reported MPG so inaccurate? (2.5 MPG on this trip)
I guess the main lesson learned here is that my typical driving conditions must be pretty demanding compared to those used for the EPA ratings. Yet another reason living in Orange County is too damned expensive! But I'm very glad to have finally gotten this test out of the way. It helps me to relax and fully enjoy my sweet new ride.
I'll check in with the service manager at my dealer (Norm Reeves in Irvine, CA) to let her know that things aren't as bad as I'd initially suspected.
BTW, I'll update the original post in this thread to reflect these findings. Thanks to everyone who has participated in the discussion. We can keep it going, if you like, but I think I'm satisfied for now with my RL's performance.