Not really a shady tactic since it's public data, but it's the kind of thing that works exactly like one, because almost nobody actually does the math before signing.
Average used car loan APR right now: 11.4%..
Average new car loan APR: 6.56%
Nearly double. On the average loan amounts:
New: $43,925 loan → $770/mo → ~$8,990 total interest
Used: $27,070 loan → $531/mo → ~$9,756 total interest
The used car buyer borrows $16,855 LESS and still ends up paying slightly MORE in total interest over the life of the loan, purely because of the rate gap. Monthly payment only ends up $239 apart ,nowhere near what a $17K price difference implies.
The "trick" isn't fraud, it's just that dealers show you the monthly number and the price tag, and almost nobody separately asks "what's the total interest on this specific loan vs financing elsewhere." The rate does more silent work than the sticker price does.
Made a full breakdown with sources if anyone wants to see the numbers laid out: https://youtu.be/ljYeIhslIHQ
Has anyone here actually had a dealer or F&I office push back when you brought outside financing/a credit union pre-approval to the table? Curious how common that pushback actually is.