Just got back from the vacation trip to Lake Placid. Total mileage on the new engine is around 1,200 miles. The highway mileage on the uphill route to upstate NY was 17.0 mpg. The "city" fuel mileage for the 200 miles around town while we were up there, was 14.5 mpg.
I changed the oil the last night when we got home and saved a sample to send in for baseline analysis. Magnetic drain plug was clean.
I just got back from filling the tank to the top. The fully loaded return trip (downhill from 2,000 foot elevation) got us 18.31 mpg highway. A new record! Not bad for a 8600 lb GVW Suburban with 4.10 gears and Yokohama Geolander 265/75x16 tires
The truck ran flawlessly. No noises, glitches, twitches, drips, etc. I am very pleased with the results and the new low compression AM/GEP engine. Very smooth running at speed.
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