Date registered: Aug 2009
Vehicle: 1999 SL 500 SL-2
Location: Nokesville, Va
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
I babied our 1999 SL500 (purchased with 36k miles) for the 1st 6 years we owned it, and the MPG was always in the low 20s. Tune up maintenance always performed per schedule, so no issues with plugs, filters, oil changes (even even final drive ring gear).
This year, I started taking the car on 300 mile round trip drives (overnighter trips) with the wife (she owns a 2006 911 cabrio AWD 6 speed manual), since she wants the top down miles on my car, since it has set around unused more.
So the SL now has 52K miles (she has 53K miles on her car), and I'm getting 26-28 mpg now, loaded with small dog, luggage, top down (or up and AC on) for these jaunts. This is hilly country with 50% flat, 65-70 mph, north-south legs, temp in the 70s-100s.
Her car on the same trip gets around 25-26 mpg, although it weighs 750 lbs less, has a better drag ceof, a 3.6 liter engine, and a manual.
At 2000 rpm, I'm doing about 70 in the SL, and her car is probably 63 mph at 2000 in top gear.
1999 SL500 SL-2
2006 Porsche 997.1 Cabrio AWD
2006 Town Car Signature Limited
1991 VW Westfalia Camper
1983 GL1100 Honda Goldwing Standard
2000 GL1500 Honda Goldwing SE