diff --git a/vehicle/OVMS.V3/components/vehicle/vehicle.cpp b/vehicle/OVMS.V3/components/vehicle/vehicle.cpp
index aae5fe565..95f6f131d 100644
--- a/vehicle/OVMS.V3/components/vehicle/vehicle.cpp
+++ b/vehicle/OVMS.V3/components/vehicle/vehicle.cpp
@@ -1995,7 +1995,7 @@ void OvmsVehicle::NotifyGridLog()
     << std::noboolalpha
     << "," << (StdMetrics.ms_v_pos_gpslock->AsBool() ? 1 : 0)
     << std::fixed
-    << std::setprecision(8)
+    << std::setprecision(6)
     << "," << StdMetrics.ms_v_pos_latitude->AsFloat()
     << "," << StdMetrics.ms_v_pos_longitude->AsFloat()
     << std::setprecision(1)
diff --git a/vehicle/OVMS.V3/components/vehicle_renaulttwizy/src/rt_notify.cpp b/vehicle/OVMS.V3/components/vehicle_renaulttwizy/src/rt_notify.cpp
index 1404514ea..75dd3cbb9 100644
--- a/vehicle/OVMS.V3/components/vehicle_renaulttwizy/src/rt_notify.cpp
+++ b/vehicle/OVMS.V3/components/vehicle_renaulttwizy/src/rt_notify.cpp
@@ -300,7 +300,7 @@ void OvmsVehicleRenaultTwizy::SendGPSLog()
     << "RT-GPS-Log,"
     << (long) (StdMetrics.ms_v_pos_odometer->AsFloat(0, Miles) * 10) // in 1/10 mi
     << ",86400"
-    << setprecision(8)
+    << setprecision(6)
     << fixed
     << "," << StdMetrics.ms_v_pos_latitude->AsFloat()
     << "," << StdMetrics.ms_v_pos_longitude->AsFloat()
diff --git a/vehicle/OVMS.V3/main/metrics_standard.cpp b/vehicle/OVMS.V3/main/metrics_standard.cpp
index 9a7ad060a..ddcb3ab50 100644
--- a/vehicle/OVMS.V3/main/metrics_standard.cpp
+++ b/vehicle/OVMS.V3/main/metrics_standard.cpp
@@ -274,6 +274,12 @@ MetricsStandard::MetricsStandard()
   ms_v_pos_valet_longitude = new OvmsMetricFloat(MS_V_POS_VALET_LONGITUDE, SM_STALE_NONE, Other, true);
   ms_v_pos_valet_distance = new OvmsMetricFloat(MS_V_POS_VALET_DISTANCE, SM_STALE_HIGH, Meters, true);
 
+  // Use fixed 6 digit precision for latitude/longitude formatting:
+  ms_v_pos_latitude->SetFormat(6, true);
+  ms_v_pos_longitude->SetFormat(6, true);
+  ms_v_pos_valet_latitude->SetFormat(6, true);
+  ms_v_pos_valet_longitude->SetFormat(6, true);
+
   //
   // TPMS: tyre monitoring metrics
   //
diff --git a/vehicle/OVMS.V3/main/ovms_metrics.cpp b/vehicle/OVMS.V3/main/ovms_metrics.cpp
index 03bc87ba9..443227b1d 100644
--- a/vehicle/OVMS.V3/main/ovms_metrics.cpp
+++ b/vehicle/OVMS.V3/main/ovms_metrics.cpp
@@ -2142,6 +2142,8 @@ OvmsMetricFloat::OvmsMetricFloat(const char* name, uint16_t autostale, metric_un
   m_value = 0.0;
   m_valuep = NULL;
   m_persist = persist;
+  m_fmt_prec = -1;
+  m_fmt_fixed = false;
 
   if (m_persist)
     {
@@ -2203,9 +2205,18 @@ std::string OvmsMetricFloat::AsString(const char* defvalue, metric_unit_t units,
     std::ostringstream ss;
     if (precision >= 0)
       {
-      ss.precision(precision); // Set desired precision
+      // Set desired fixed precision format:
+      ss.precision(precision);
       ss << fixed;
       }
+    else
+      {
+      // Set standard metric format:
+      if (m_fmt_prec >= 0)
+        ss.precision(m_fmt_prec);
+      if (m_fmt_fixed)
+        ss << fixed;
+      }
     if ((units != Other)&&(units != m_units))
       ss << UnitConvert(m_units,units,m_value);
     else
@@ -2248,7 +2259,9 @@ int OvmsMetricFloat::AsInt(const int defvalue, metric_unit_t units)
 #ifdef CONFIG_OVMS_SC_JAVASCRIPT_DUKTAPE
 void OvmsMetricFloat::DukPush(DukContext &dc, metric_unit_t units)
   {
-  dc.Push(AsFloat(0, units));
+  // Support custom precisions & minimize errors on float→double conversion:
+  std::string fval = AsString("0", units);
+  dc.Push(strtod(fval.c_str(), NULL));
   }
 #endif
 
diff --git a/vehicle/OVMS.V3/main/ovms_metrics.h b/vehicle/OVMS.V3/main/ovms_metrics.h
index 5e8b62651..68405af30 100644
--- a/vehicle/OVMS.V3/main/ovms_metrics.h
+++ b/vehicle/OVMS.V3/main/ovms_metrics.h
@@ -336,6 +336,7 @@ class OvmsMetricFloat : public OvmsMetric
     ~OvmsMetricFloat() override;
 
   public:
+    void SetFormat(int precision = -1, bool fixed = false) { m_fmt_prec = precision; m_fmt_fixed = fixed; }
     std::string AsString(const char* defvalue = "", metric_unit_t units = Other, int precision = -1) override;
     std::string AsJSON(const char* defvalue = "", metric_unit_t units = Other, int precision = -1) override;
     float AsFloat(const float defvalue = 0, metric_unit_t units = Other) override;
@@ -355,6 +356,8 @@ class OvmsMetricFloat : public OvmsMetric
   protected:
     float m_value;
     float* m_valuep;
+    int m_fmt_prec;
+    bool m_fmt_fixed;
   };
 
 class OvmsMetricString : public OvmsMetric