Well I changed the coolant and the thermostat. Now the temp gets to about 85 C vs about 70 C before. I have a hard time believing my MPG will improve any since I was getting 31 in mixed driving already. I thought when I took out the old one it would be partially stuck open but it was not. Maybe the spring got weak?

The G-05 coolant is the same color as the OE, straw yellow.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra