Originally Posted by txfiremn
I was just thinking about this today. I took the kids to the Fort Worth Zoo today from Waco, I never got above 20.8 mpg. I was traveling, on average, at 75-80 mph with an A6 an stock 5.0.
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The auto has a shorter OD ratio in 6th gear than the manuals do. 75-80 MPH in an auto is like turning 2400 RPM.
Originally Posted by NAVAG
Mine has 3:31 Gears or what Ford calls "Rear Axle Promo Pack"
With Bama performance tune on the Highway I get 27-28 MPG...when I go the speed limit and I set Cruise Control. Above 2K RPM and the MPG drops like a ton of bricks.
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I have gotten 25-25.5 multiple times on trips home, south of Houston, doing 80-85 on I45 almost the entire time. Surprisingly the over 2k theory isn't as bad on these cars as I've seen in the past. I've actually found that there is a second sweet spot around 80 MPH that if you set cruise at, you can still get good MPG for the speed and RPM you are turning.
Originally Posted by NAVAG
I have about the same commute. 65-70mph gets me the best MPG. Much below 60 and the engine has to work harder in 6th gear. I usually reset my MPG each time I leave the house to make the 60 mile drive to work and IF I don't stomp on it much I get around 27-28. I got 29 on one trip but I drove 65 and slower the whole way. It's really hard to do. lol.
Not sure how accurate the MPG gauge is in the Premium but since I started driving slow I can make 2 1/2 trips to work and back before I fill it up again. Still too many miles and I'm going to buy a beater for DD asap.
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The in dash MPG calculator is really accurate. I've hardly ever been more than +/- 0.5 MPG off hand calculations with it, and over the life of the car it's been a running average of +/- 0.3 MPG difference