I also went with the TDI. 2011 Prestige S-Line, awesome. It was my towing needs, plus also the low-rpm torque available, relatively inexpensive diesel costs in AZ, and 47 months of dieselgate warranty that helped make the decision. The DEF / AdBlue wants a refill twice in the 6 months I’ve owned it, which is kind of annoying.
I had a “what the hell” moment and bought a container of Hot Shot’s Secret Diesel Extreme and poured in 10oz IIRC in January this year. I’ve been tracking the mpg, and here’s what I’ve logged so far:
18.5 mpg 90% city (~45mph tops, too many stop lights - this is a heavy hippo to stop and start)
23.7 mpg (80% hwy at 80mph generally)
29.2 mpg (100% hwy at 70mph usually - and that was loaded with a family of four and luggage but a flat drive; few elevation changes)
22.3 mpg hwy (mountains this time)
20.4 mpg (75% city)
18.7 mpg (100% city)
20.7 mpg (50% city)
16.5 mpg (95% city, this time I was doing a little towing...oh and I drag raced a bison (kidding))
Unfortunately I didn’t log the mpg stats before the Hot Shot. 17/20 is what the sales sticker said. Obviously Audi is to be completely trusted on those figures...cough cough.
To boost the mpg efficiency, here’s what I’ve learned. In the city, plan a route if you can that will allow the fewest likely stops. When you stop, brake early, lightly, and consistently (heard about the cost of brake pads and rotors??). Start with the foot off the gas to let the idle power pull you from the stand still, then let on the gas with consistent pressure. On the highway, I’ve noticed the highest mpg numbers were achieved when I kept my speed between 60-70 mph. It went down again at 70-80 mph. My average trip mpg for highway trips that I kept it at 65 mph was between 38-44mpg.
Not easy to sustain that 65mph target though, when you have hungry and grouchy kids/wife in the car with you. I did the calculations for what it cost to go 80mph on I-8 and get to California 2 hours quicker than at 65mph: it was $10. MONEY WELL SPENT!
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