My 380SE get about 25MPG on the road and 19 MPG in town. not far off of the diesel's MPG. With diesel being the same or more than gas right now, I think I'd keep the 380SEC.

Nice looking car.
I have a 560SEC and now just drive it on weekends because of the price of Gas, The 380SE is my Daily driver.

__________________
1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.