Fuel mileage loss After minor repair

I have a C 15 accert. And I also have a Scan Gauge that has been accurate for the last few years. But I’ve lost 1 mile per gallon at least since Truck was in shop to have a actuator replaced and a new radiator. Been pulling light loads text should be getting me 7 miles per gallon but only getting 5.8 but Scan Gauge still shows I am getting between 6.8 and 7.2 . Any ideas what to look for is costing me about 250 Miles on every fuel up

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