BrokerRuss Posted February 5, 2022 We have a 2019 nv3500 SL curious if anyone has used any of the performance chips out there Thornton Bully Dog Etc and have they seen an increase in gas mileage. Thanks Quote Share this post Link to post Share on other sites
crusty Posted February 6, 2022 It's not a diesel, tuners have little change on modern gas engines. Quote Share this post Link to post Share on other sites
radin2son Posted February 6, 2022 That’s backed up by ASD Dad. Check out his review posts under Engines (older V8). Quote Share this post Link to post Share on other sites
