diff --git a/core/txpool/blobpool/blobpool.go b/core/txpool/blobpool/blobpool.go
index 382cf96d75..64ee3fcd9a 100644
--- a/core/txpool/blobpool/blobpool.go
+++ b/core/txpool/blobpool/blobpool.go
@@ -1398,7 +1398,7 @@ func (p *BlobPool) AvailableBlobs(vhashes []common.Hash) int {
 }
 
 // convertSidecar converts the legacy sidecar in the submitted transactions
-// if osaka fork has been activated.
+// if Osaka fork has been activated.
 func (p *BlobPool) convertSidecar(txs []*types.Transaction) ([]*types.Transaction, []error) {
 	head := p.chain.CurrentBlock()
 	if !p.chain.Config().IsOsaka(head.Number, head.Time) {
diff --git a/core/txpool/blobpool/blobpool_test.go b/core/txpool/blobpool/blobpool_test.go
index cc7dda6c03..51ab27eb01 100644
--- a/core/txpool/blobpool/blobpool_test.go
+++ b/core/txpool/blobpool/blobpool_test.go
@@ -1705,25 +1705,8 @@ func TestAddLegacyBlobTx(t *testing.T) {
 	statedb.AddBalance(addr2, uint256.NewInt(1_000_000_000), tracing.BalanceChangeUnspecified)
 	statedb.Commit(0, true, false)
 
-	// Make Prague-enabled custom chain config.
-	cancunTime := uint64(0)
-	pragueTime := uint64(0)
-	osakaTime := uint64(0)
-	config := &params.ChainConfig{
-		ChainID:     big.NewInt(1),
-		LondonBlock: big.NewInt(0),
-		BerlinBlock: big.NewInt(0),
-		CancunTime:  &cancunTime,
-		PragueTime:  &pragueTime,
-		OsakaTime:   &osakaTime,
-		BlobScheduleConfig: &params.BlobScheduleConfig{
-			Cancun: params.DefaultCancunBlobConfig,
-			Prague: params.DefaultPragueBlobConfig,
-			Osaka:  params.DefaultOsakaBlobConfig,
-		},
-	}
 	chain := &testBlockChain{
-		config:  config,
+		config:  params.MergedTestChainConfig,
 		basefee: uint256.NewInt(1050),
 		blobfee: uint256.NewInt(105),
 		statedb: statedb,
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index c75cca6852..693edfbd78 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1521,9 +1521,8 @@ func (api *TransactionAPI) FillTransaction(ctx context.Context, args Transaction
 	// Set some sanity defaults and terminate on failure
 	sidecarVersion := types.BlobSidecarVersion0
 	if len(args.Blobs) > 0 {
-		chainHead := api.b.CurrentHeader()
-		isOsaka := api.b.ChainConfig().IsOsaka(chainHead.Number, chainHead.Time)
-		if isOsaka {
+		h := api.b.CurrentHeader()
+		if api.b.ChainConfig().IsOsaka(h.Number, h.Time) {
 			sidecarVersion = types.BlobSidecarVersion1
 		}
 	}
@@ -1599,9 +1598,8 @@ func (api *TransactionAPI) SignTransaction(ctx context.Context, args Transaction
 	}
 	sidecarVersion := types.BlobSidecarVersion0
 	if len(args.Blobs) > 0 {
-		chainHead := api.b.CurrentHeader()
-		isOsaka := api.b.ChainConfig().IsOsaka(chainHead.Number, chainHead.Time)
-		if isOsaka {
+		h := api.b.CurrentHeader()
+		if api.b.ChainConfig().IsOsaka(h.Number, h.Time) {
 			sidecarVersion = types.BlobSidecarVersion1
 		}
 	}
diff --git a/internal/ethapi/transaction_args.go b/internal/ethapi/transaction_args.go
index d671d69a2c..f80ef6d080 100644
--- a/internal/ethapi/transaction_args.go
+++ b/internal/ethapi/transaction_args.go
@@ -162,7 +162,7 @@ func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend, config
 			return err
 		}
 		args.Gas = &estimated
-		log.Trace("Estimate gas usage automatically", "gas", args.Gas)
+		log.Trace("Estimated gas usage automatically", "gas", args.Gas)
 	}
 
 	// If chain id is provided, ensure it matches the local chain id. Otherwise, set the local