How Consolidating Our Vehicle Supply Purchasing Cut Costs 23% in Six Months

The Quarter That Didn't Add Up

April 2024, Tuesday afternoon. I'm reconciling our Q1 purchasing data when finance forwards me an email: "Your vehicle supplies spending is up 18% quarter-over-quarter. Can you explain?"

Eighteen percent came out to roughly $4,200. Sounds small until you try to trace it. That money was spread across 14 vendors—local parts shops, online marketplaces, a couple of one-off purchases nobody remembered authorizing.

I told finance I'd dig into it. Then I spent two days just categorizing every line item.

The finding surprised me. Prices hadn't gone up. What happened was we'd added two new distribution points. The teams there inherited purchase habits from the main warehouse—each site ordering independently, each with its own vendor mix.

Nobody thought it was a problem. Every individual order looked reasonable. But 18 "reasonable" orders per quarter multiply into a number that no single person was tracking.

Where I Started: Cleaners

I wanted to pilot something with decent spend volume and low switching risk. Cleaning products were the obvious target—glass cleaner, tire shine, body wash. We bought them every quarter, usage was predictable, and brand loyalty was... well, let me get to that.

Our fleet supervisor had used the same brand for years. Why? "That's what dealerships use."

I paused on that one. Yes, dealerships use quality products. But dealerships also buy at fleet pricing. We were buying the same brands at retail-adjacent rates. And more to the point—what tire shine do dealerships use is a different question than what tire shine should a 48-truck delivery fleet use. Our vehicles aren't sitting in a showroom. They're running routes in South Carolina heat.

So I started actually looking at ingredient labels. I pulled the Zep glass cleaner ingredients list—mostly isopropyl alcohol and a couple of surfactants. Then I compared three alternatives. Same active ingredients, different pricing by nearly 40% on the high end.

We weren't paying for quality. We were paying for a default nobody had questioned in years.

That realization reframed the whole project. This wasn't a negotiation problem. It was a process problem.

The Unexpected Turn: Finding Coverage Where I Wasn't Looking

Before committing to any vendor, I wanted to understand what a consolidated supplier could actually cover. I started evaluating Optimum—the automotive accessories and tools distributor—mostly out of curiosity. Their catalog spanned a lot: car electronics, portable power, diagnostic tools, towing and roof racks, RV parts.

Nice list. But vendor marketing always looks good. What I wanted to know was: could they handle 70% of our recurring needs in a single order?

First test order was deliberately mixed. Cleaning supplies plus a winch for hitch receiver our trailer crew had been asking to replace for months.

The winch part genuinely surprised me. Previously we'd buy the winch from one place, the mount from another, the wiring kit from a third. Optimum shipped a complete kit—winch, bracket, cables, hook. Our mechanic looked at the packaging and said, "This just saved me half a day of assembly."

But the real pivot happened the following month.

We have a warehouse near Inman, South Carolina. One of the work trucks there needed an urgent towing accessory replacement. Standard shipping from our main hub would take three days. I was already mapping out a route to the nearest parts shop when my account rep casually mentioned: "Did you know about the Optimum RV Inman SC location? They probably have it in stock."

I didn't. We'd been sourcing from a hub several hundred miles away while a physical location sat within easy driving distance. Same-day pickup. Cost ended up roughly $300 less than the emergency options I'd been pricing.

That's when I actually studied their network. Turns out they have a decent footprint of RV and truck parts locations nationwide. I'd overlooked it because I assumed "automotive supplier" meant online-only wholesale.

The Result: Where the Savings Actually Came From

Six months after consolidating to one primary supplier (Optimum) plus two specialty backups, our quarter-over-quarter vehicle supply spend dropped from roughly $28,000 to $21,500. About 23%.

Here's the breakdown, because I think it matters:

• Unit price differences: ~5-6% of the savings
• Reduced administrative overhead (fewer invoices, fewer contacts, fewer reconciliation hours): ~10%
• Eliminated emergency sourcing and duplicate shipping: ~7-8%

Read that again. The majority of the savings didn't come from negotiating better prices. It came from not having to manage 14 separate order streams.

What I'd Do Differently

I don't have hard data on how universal this pattern is. What I can say from our experience is that fragmentation has costs that don't show up on any single invoice—they show up in labor hours, in errors, in the time you spend chasing down who ordered what from where.

Two things I'd change if I ran this again:

First, I'd standardize the purchasing process before switching vendors. We had a two-month lag where new sites were still ordering independently because we hadn't finished consolidating the workflow. That window cost us.

Second, I'd check physical location coverage earlier. The Inman discovery happened by accident. If I'd actually looked at their footprint upfront, we could have used local pickup from the start.

Not everything worked. The Optimum Home line skews more toward residential and outdoor retail—pricing structure didn't fit our fleet procurement. I tried it once. Good products, wrong context for us.

Electronics are similar. Wide selection but not the depth of a dedicated diagnostics supplier. If you need very specific professional-grade scan tools, you may still want a vertical vendor.

The Takeaway

If you're sitting on a pile of scattered purchase orders and nobody can tell you what your actual vehicle supply spend looks like—before you go hunting for cheaper unit prices, look at your process first. We weren't being overcharged. We were being disorganized in a way that was easy to miss because every individual order seemed fine.

That's the part nobody tells you about procurement efficiency. It's not about finding the best deal. It's about making the money you're already spending visible.