diff --git a/firmware/controllers/algo/engine_configuration.cpp b/firmware/controllers/algo/engine_configuration.cpp
index afcb054161..23f92ec5f3 100644
--- a/firmware/controllers/algo/engine_configuration.cpp
+++ b/firmware/controllers/algo/engine_configuration.cpp
@@ -1416,6 +1416,15 @@ void validateConfiguration(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
 		engineConfiguration->adcVcc = 3.0f;
 	}
 	engine->preCalculate(PASS_ENGINE_PARAMETER_SIGNATURE);
+
+	/**
+	 * TunerStudio text tune files convert negative zero into positive zero so to keep things consistent we should avoid
+	 * negative zeros altogether. Unfortunately default configuration had one and here we are mitigating that.
+	 */
+	for (int i = 0;i < CLT_CURVE_SIZE;i++) {
+		engineConfiguration->cltIdleRpmBins[i] = fixNegativeZero(engineConfiguration->cltIdleRpmBins[i]);
+	}
+
 }
 
 void applyNonPersistentConfiguration(Logging * logger DECLARE_ENGINE_PARAMETER_SUFFIX) {
diff --git a/firmware/util/efilib.cpp b/firmware/util/efilib.cpp
index 8360321914..b35322bab8 100644
--- a/firmware/util/efilib.cpp
+++ b/firmware/util/efilib.cpp
@@ -36,7 +36,7 @@ float efiFloor(float value, float precision) {
 float efiRound(float value, float precision) {
 	efiAssert(CUSTOM_ERR_ASSERT, precision != 0, "zero precision", NAN);
 	float a = rintf (value / precision);
-	return a * precision;
+	return fixNegativeZero(a * precision);
 }
 
 float absF(float value) {
diff --git a/firmware/util/efilib.h b/firmware/util/efilib.h
index 7bffa3fa72..06b195bf4f 100644
--- a/firmware/util/efilib.h
+++ b/firmware/util/efilib.h
@@ -87,6 +87,7 @@ float expf_taylor(float x);
 #include <cstddef>
 
 #define IS_NEGATIVE_ZERO(value) (std::signbit(value) && value==0)
+#define fixNegativeZero(value) (IS_NEGATIVE_ZERO(value) ? 0 : value)
 
 // C++ helpers go here
 namespace efi
diff --git a/java_console/ui/src/test/java/com/rusefi/ui/TuneReadWriteTest.java b/java_console/ui/src/test/java/com/rusefi/ui/TuneReadWriteTest.java
index cb71620866..6fa397d04a 100644
--- a/java_console/ui/src/test/java/com/rusefi/ui/TuneReadWriteTest.java
+++ b/java_console/ui/src/test/java/com/rusefi/ui/TuneReadWriteTest.java
@@ -38,18 +38,18 @@ public class TuneReadWriteTest {
 
         int mismatchCounter = compareImages(tsBinaryData, fileBinaryData);
         // todo: why one byte mismatch? since it's in floats I kind of do not care, floats are weird
-        assertEquals(1, mismatchCounter);
+        assertEquals(0, mismatchCounter);
     }
 
     @Test
     public void testWriteAndReadTSTune() throws Exception {
-        ConfigurationImage originalBinaryData = ConfigurationImageFile.readFromFile(TEST_BINARY_FILE);
+        ConfigurationImage fileBinaryData = ConfigurationImageFile.readFromFile(TEST_BINARY_FILE);
 
         Path path = Files.createTempFile("unit_test_", ".xml");
         String fileName = path.getFileName().toString();
 
         // writing TS XML tune file with rusEFI code
-        Msq tuneFromBinary = Msq.valueOf(originalBinaryData);
+        Msq tuneFromBinary = Msq.valueOf(fileBinaryData);
         tuneFromBinary.writeXmlFile(fileName);
 
         // and now reading that XML back
@@ -57,13 +57,14 @@ public class TuneReadWriteTest {
 
         ConfigurationImage binaryDataFromXml = tuneFromFile.asImage(IniFileModel.getInstance());
 
-        assertEquals(0, compareImages(originalBinaryData, binaryDataFromXml));
+        assertEquals(0, compareImages(binaryDataFromXml, fileBinaryData));
+        // todo: looks like this is not removing the temporary file?
         Files.delete(path);
     }
 
-    private static int compareImages(ConfigurationImage image1, ConfigurationImage image2) {
+    private static int compareImages(ConfigurationImage image1, ConfigurationImage fileData) {
         byte[] tsBinaryDataContent = image1.getContent();
-        byte[] fileBinaryDataContent = image2.getContent();
+        byte[] fileBinaryDataContent = fileData.getContent();
 
         int mismatchCounter = 0;
 
@@ -72,7 +73,7 @@ public class TuneReadWriteTest {
             byte fileByte = fileBinaryDataContent[i];
             if (tsByte != fileByte) {
                 IniField field = IniFileModel.getInstance().findByOffset(i);
-                System.out.println("Mismatch at " + (field == null ? "offset " + i : field) + " " + tsByte + "/" + fileByte);
+                System.out.println("Mismatch at offset=" + i + ", " + (field == null ? "(no field)" : field) + " runtime=" + tsByte + "/file=" + fileByte);
                 mismatchCounter++;
             }
         }
diff --git a/java_console/ui/src/test/resources/frankenso/current_configuration.rusefi_binary b/java_console/ui/src/test/resources/frankenso/current_configuration.rusefi_binary
index c63b9496cc..80c8583d21 100644
Binary files a/java_console/ui/src/test/resources/frankenso/current_configuration.rusefi_binary and b/java_console/ui/src/test/resources/frankenso/current_configuration.rusefi_binary differ