diff --git a/src/main.rs b/src/main.rs
index 9e1c56da..284850c6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -233,6 +233,10 @@ struct Cli {
     /// Show Gas details information
     show_gas_details: ShowGasDetails,
 
+    #[arg(long)]
+    /// If provided, uses a custom value as the L1 gas price.
+    l1_gas_price: Option<u64>,
+
     #[arg(long)]
     /// If provided, uses a custom value as the L2 gas price. If not provided the gas price will be
     /// inferred from the protocol version.
@@ -395,6 +399,7 @@ async fn main() -> anyhow::Result<()> {
         fork_details,
         Some(observability),
         InMemoryNodeConfig {
+            l1_gas_price: opt.l1_gas_price,
             l2_fair_gas_price,
             show_calls: opt.show_calls,
             show_outputs: opt.show_outputs,
diff --git a/src/node/fee_model.rs b/src/node/fee_model.rs
index 609ecc81..c29185ec 100644
--- a/src/node/fee_model.rs
+++ b/src/node/fee_model.rs
@@ -5,7 +5,7 @@ use zksync_types::L1_GAS_PER_PUBDATA_BYTE;
 
 use super::{
     DEFAULT_ESTIMATE_GAS_PRICE_SCALE_FACTOR, DEFAULT_ESTIMATE_GAS_SCALE_FACTOR,
-    DEFAULT_L2_GAS_PRICE, L1_GAS_PRICE,
+    DEFAULT_L1_GAS_PRICE, DEFAULT_L2_GAS_PRICE,
 };
 
 #[derive(Debug, Clone, PartialEq)]
@@ -84,8 +84,8 @@ impl BatchFeeModelInputProvider for TestNodeFeeInputProvider {
 impl Default for TestNodeFeeInputProvider {
     fn default() -> Self {
         Self {
-            l1_gas_price: L1_GAS_PRICE,
-            l1_pubdata_price: L1_GAS_PRICE * L1_GAS_PER_PUBDATA_BYTE as u64,
+            l1_gas_price: DEFAULT_L1_GAS_PRICE,
+            l1_pubdata_price: DEFAULT_L1_GAS_PRICE * L1_GAS_PER_PUBDATA_BYTE as u64,
             l2_gas_price: DEFAULT_L2_GAS_PRICE,
             compute_overhead_part: 0.0,
             pubdata_overhead_part: 1.0,
diff --git a/src/node/in_memory.rs b/src/node/in_memory.rs
index d8b52887..23d57ce8 100644
--- a/src/node/in_memory.rs
+++ b/src/node/in_memory.rs
@@ -74,7 +74,7 @@ pub const NON_FORK_FIRST_BLOCK_TIMESTAMP: u64 = 1_000;
 /// Network ID we use for the test node.
 pub const TEST_NODE_NETWORK_ID: u32 = 260;
 /// L1 Gas Price.
-pub const L1_GAS_PRICE: u64 = 50_000_000_000;
+pub const DEFAULT_L1_GAS_PRICE: u64 = 50_000_000_000;
 // TODO: for now, that's fine, as computation overhead is set to zero, but we may consider using calculated fee input everywhere.
 /// The default L2 Gas Price to be used if not supplied via the CLI argument.
 pub const DEFAULT_L2_GAS_PRICE: u64 = 25_000_000;
@@ -884,6 +884,7 @@ pub struct Snapshot {
 #[derive(Debug, Clone)]
 pub struct InMemoryNodeConfig {
     // The values to be used when calculating gas.
+    pub l1_gas_price: Option<u64>,
     pub l2_fair_gas_price: u64,
     pub show_calls: ShowCalls,
     pub show_outputs: bool,
@@ -897,6 +898,7 @@ pub struct InMemoryNodeConfig {
 impl Default for InMemoryNodeConfig {
     fn default() -> Self {
         Self {
+            l1_gas_price: None,
             l2_fair_gas_price: DEFAULT_L2_GAS_PRICE,
             show_calls: Default::default(),
             show_outputs: Default::default(),
@@ -943,6 +945,22 @@ impl<S: ForkSource + std::fmt::Debug + Clone> InMemoryNode<S> {
         observability: Option<Observability>,
         config: InMemoryNodeConfig,
     ) -> Self {
+        let default_l1_gas_price = if let Some(f) = &fork {
+            f.l1_gas_price
+        } else {
+            DEFAULT_L1_GAS_PRICE
+        };
+        let l1_gas_price = if let Some(custom_l1_gas_price) = config.l1_gas_price {
+            tracing::info!(
+                "L1 gas price set to {} (overridden from {})",
+                to_human_size(custom_l1_gas_price.into()),
+                to_human_size(default_l1_gas_price.into())
+            );
+            custom_l1_gas_price
+        } else {
+            default_l1_gas_price
+        };
+
         let inner = if let Some(f) = &fork {
             let mut block_hashes = HashMap::<u64, H256>::new();
             block_hashes.insert(f.l2_block.number.as_u64(), f.l2_block.hash);
@@ -961,6 +979,7 @@ impl<S: ForkSource + std::fmt::Debug + Clone> InMemoryNode<S> {
                     f.estimate_gas_scale_factor,
                 )
             };
+            fee_input_provider.l1_gas_price = l1_gas_price;
             fee_input_provider.l2_gas_price = config.l2_fair_gas_price;
 
             InMemoryNodeInner {
@@ -997,12 +1016,16 @@ impl<S: ForkSource + std::fmt::Debug + Clone> InMemoryNode<S> {
                 create_empty_block(0, NON_FORK_FIRST_BLOCK_TIMESTAMP, 0, None),
             );
 
+            let fee_input_provider = TestNodeFeeInputProvider {
+                l1_gas_price,
+                ..Default::default()
+            };
             InMemoryNodeInner {
                 current_timestamp: NON_FORK_FIRST_BLOCK_TIMESTAMP,
                 current_batch: 0,
                 current_miniblock: 0,
                 current_miniblock_hash: block_hash,
-                fee_input_provider: TestNodeFeeInputProvider::default(),
+                fee_input_provider,
                 tx_results: Default::default(),
                 blocks,
                 block_hashes,