diff --git a/Gas Man/FuelLogs/AddFuelLogView.swift b/Gas Man/FuelLogs/AddFuelLogView.swift
index cc1f8c6..99506a6 100644
--- a/Gas Man/FuelLogs/AddFuelLogView.swift	
+++ b/Gas Man/FuelLogs/AddFuelLogView.swift	
@@ -23,9 +23,9 @@ struct AddFuelLogView: View {
     @State private var locationName = ""
     @State private var selectedOctane: Int = 87  // Default or from previous record
     @State private var pricePerGalon = ""
-    // New Full Tank toggle; default is on (true)
     @State private var fullTank: Bool = true
-    
+    @State private var missedPrevious: Bool = false
+
     // Allowed octane options
     let octaneOptions = [87, 89, 91, 92, 93, 95]
     
@@ -115,6 +115,9 @@ struct AddFuelLogView: View {
                     Toggle("Full Tank", isOn: $fullTank)
                         .toggleStyle(SwitchToggleStyle(tint: .blue))
                     
+                    Toggle("Missed Previous Fill-up", isOn: $missedPrevious)
+                        .toggleStyle(SwitchToggleStyle(tint: .blue))
+                    
                     Button("Get Current Location") {
                         locationManager.requestLocation()
                     }
@@ -255,8 +258,8 @@ struct AddFuelLogView: View {
         newLog.locationName = locationName
         newLog.octane = Int16(selectedOctane)
         newLog.pricePerGalon = Double(pricePerGalon) ?? 0
-        // Set the fullTank property from the toggle:
         newLog.fullTank = fullTank
+        newLog.missedPrevious = missedPrevious
         
         if let vehicleID = selectedVehicleID,
            let selectedVehicle = vehicles.first(where: { $0.id == vehicleID }) {
diff --git a/Gas Man/FuelLogs/EditFuelLogView.swift b/Gas Man/FuelLogs/EditFuelLogView.swift
index 571a3ea..71d28ed 100644
--- a/Gas Man/FuelLogs/EditFuelLogView.swift	
+++ b/Gas Man/FuelLogs/EditFuelLogView.swift	
@@ -24,8 +24,8 @@ struct EditFuelLogView: View {
     @State private var locationName = ""
     @State private var selectedOctane: Int = 87
     @State private var pricePerGalon = ""
-    // Full Tank toggle
     @State private var fullTank: Bool = true
+    @State private var missedPrevious: Bool = false
 
     // Allowed octane options
     let octaneOptions = [87, 89, 91, 92, 93, 95]
@@ -89,6 +89,9 @@ struct EditFuelLogView: View {
                     Toggle("Full Tank", isOn: $fullTank)
                         .toggleStyle(SwitchToggleStyle(tint: .blue))
                     
+                    Toggle("Missed Previous Fill-up", isOn: $missedPrevious)
+                        .toggleStyle(SwitchToggleStyle(tint: .blue))
+                    
                     Button("Get Current Location") {
                         // Optionally trigger location update
                     }
@@ -130,6 +133,7 @@ struct EditFuelLogView: View {
         cost = String(format: "%.2f", fuelLog.cost)
         pricePerGalon = String(format: "%.3f", fuelLog.pricePerGalon)
         fullTank = fuelLog.fullTank
+        missedPrevious = fuelLog.missedPrevious
         locationCoordinates = fuelLog.locationCoordinates ?? ""
         locationName = fuelLog.locationName ?? ""
         selectedOctane = Int(fuelLog.octane)
@@ -187,6 +191,7 @@ struct EditFuelLogView: View {
         fuelLog.octane = Int16(selectedOctane)
         fuelLog.pricePerGalon = Double(pricePerGalon) ?? 0
         fuelLog.fullTank = fullTank
+        fuelLog.missedPrevious = missedPrevious
         
         do {
             try viewContext.save()
diff --git a/Gas Man/FuelLogs/FuelLogDetailView.swift b/Gas Man/FuelLogs/FuelLogDetailView.swift
index ad5bd64..d2d58c0 100644
--- a/Gas Man/FuelLogs/FuelLogDetailView.swift	
+++ b/Gas Man/FuelLogs/FuelLogDetailView.swift	
@@ -73,6 +73,21 @@ struct FuelLogDetailView: View {
                     }
                 }
             }
+            Section {
+                HStack {
+                    Text("Previous Fill-Up")
+                    Spacer()
+                    if fuelLog.missedPrevious {
+                        Image(systemName: "xmark.circle.fill")
+                            .foregroundColor(.red)
+                        Text("Missed")
+                    } else {
+                        Image(systemName: "checkmark.circle.fill")
+                            .foregroundColor(.green)
+                        Text("Exists")
+                    }
+                }
+            }
             Section(header: Text("Location")) {
                 HStack {
                     Text("Coordinates:")
diff --git a/Gas Man/FuelLogs/FuelLogListView.swift b/Gas Man/FuelLogs/FuelLogListView.swift
index 52b1ae3..890e16e 100644
--- a/Gas Man/FuelLogs/FuelLogListView.swift	
+++ b/Gas Man/FuelLogs/FuelLogListView.swift	
@@ -57,7 +57,7 @@ struct FuelLogListView: View {
             let current = logs[i]
             let next = logs[i + 1]
             // Only include if fullTank is true, fuelVolume is positive, and odometer difference is positive.
-            if current.fullTank, current.fuelVolume > 0, current.odometer > next.odometer {
+            if current.fullTank, !current.missedPrevious, current.fuelVolume > 0, current.odometer > next.odometer {
                 let mpg = (current.odometer - next.odometer) / current.fuelVolume
                 mpgValues.append(mpg)
             }
@@ -152,6 +152,7 @@ struct FuelLogListView: View {
                         let mpg: Double? = {
                             // Only calculate MPG if fullTank is true.
                             guard log.fullTank else { return nil }
+                            guard !log.missedPrevious else { return nil }
                             guard index < filteredFuelLogs.count - 1 else { return nil }
                             let previousLog = filteredFuelLogs[index + 1]
                             let milesDriven = log.odometer - previousLog.odometer
diff --git a/Gas Man/Gas_Man.xcdatamodeld/Gas_Man.xcdatamodel/contents b/Gas Man/Gas_Man.xcdatamodeld/Gas_Man.xcdatamodel/contents
index d184a86..d237e25 100644
--- a/Gas Man/Gas_Man.xcdatamodeld/Gas_Man.xcdatamodel/contents	
+++ b/Gas Man/Gas_Man.xcdatamodeld/Gas_Man.xcdatamodel/contents	
@@ -8,6 +8,7 @@
         <attribute name="id" optional="YES" attributeType="UUID" usesScalarValueType="NO"/>
         <attribute name="locationCoordinates" optional="YES" attributeType="String"/>
         <attribute name="locationName" optional="YES" attributeType="String"/>
+        <attribute name="missedPrevious" optional="YES" attributeType="Boolean" usesScalarValueType="YES"/>
         <attribute name="octane" attributeType="Integer 16" defaultValueString="0" usesScalarValueType="YES"/>
         <attribute name="odometer" attributeType="Double" defaultValueString="0.0" usesScalarValueType="YES"/>
         <attribute name="pricePerGalon" attributeType="Double" defaultValueString="0.0" usesScalarValueType="YES"/>
diff --git a/Gas Man/Stats/MPGTrendChartView.swift b/Gas Man/Stats/MPGTrendChartView.swift
index 56c2f59..b85eb3a 100644
--- a/Gas Man/Stats/MPGTrendChartView.swift	
+++ b/Gas Man/Stats/MPGTrendChartView.swift	
@@ -14,7 +14,7 @@ struct MPGTrendChartView: View {
         for i in 1..<sortedLogs.count {
             let previous = sortedLogs[i - 1]
             let current = sortedLogs[i]
-            if current.fullTank, let date = current.date,
+            if current.fullTank, !current.missedPrevious, let date = current.date,
                current.odometer > previous.odometer,
                current.fuelVolume > 0 {
                 let mpg = (current.odometer - previous.odometer) / current.fuelVolume
diff --git a/Gas Man/Stats/StatsView.swift b/Gas Man/Stats/StatsView.swift
index ab43ba6..bd5db4a 100644
--- a/Gas Man/Stats/StatsView.swift	
+++ b/Gas Man/Stats/StatsView.swift	
@@ -49,7 +49,7 @@ struct StatsView: View {
         for i in 0..<logs.count - 1 {
             let current = logs[i]
             let next = logs[i + 1]
-            if current.fullTank, current.fuelVolume > 0, current.odometer > next.odometer {
+            if current.fullTank, !current.missedPrevious, current.fuelVolume > 0, current.odometer > next.odometer {
                 let mpg = (current.odometer - next.odometer) / current.fuelVolume
                 mpgValues.append(mpg)
             }