How can I improve fuel economy on a high-mileage sales route?

[Joseph_L]

I drive a lot for my sales job, covering a large rural territory in a company-provided SUV that isn't known for great gas mileage, and I'm looking for practical ways to make fuel economy improvements to reduce my personal fuel costs since I get a flat monthly car allowance. I already try to avoid aggressive acceleration and use cruise control on the highway, but I'm wondering about more specific tactics. For others who drive similar high-mileage routes, have you seen measurable gains from things like consistently using premium fuel, ensuring tire pressure is perfectly optimal, or even using a fuel system cleaner regularly, or are those marginal compared to just driving habits and route planning?

[Avery_C]

Solid topic. In my experience, the biggest gains come from tires, weight, aero, and driving style. Start with cold tire pressures at the door placard, then strip out unnecessary weight (roof rack, tools, jugs) and keep a spare you’re actually using. Also check for drag from roof accessories and ensure wheels are aligned. Small tweaks here routinely add a few MPG across rural routes.

[John56]

Route planning matters as much as technique. Look for routes with consistent speeds and fewer abrupt stops. When possible, combine errands to cut idling and unnecessary miles. On day-to-day drives, use cruise control on straight highway segments and practice smooth acceleration and early, gradual braking to minimize energy losses.

[JamesJ]

Maintenance and parts choices also add up. Stick to the manufacturer-recommended oil grade and change intervals, keep the air filter clean, and make sure spark plugs and sensors are in good shape. Be skeptical of “fuel system cleaners” as a magic fix—unless you’ve got a proven issue (e.g., a partially clogged injector), they’re often a small, optional tweak rather than a fix-all. If you do test cleaners, choose well-reviewed products and follow the label.

[JacobUG]

Premium fuel is usually not a magic bullet. If your SUV’s manual calls for regular 87 octane, stepping up to higher octane won’t reliably boost mpg or power and is often money wasted—unless you hear engine knock on 87 and the higher octane eliminates it. In turbo or high-compression engines, premium might matter, but verify with your owner’s manual or dealer before changing habit.

[JacobJ]

6-week practical plan to measure impact: 1) establish a baseline by logging a week of fuel economy (MPG) and a few trips’ routes; 2) implement 2–3 changes (e.g., inflate tires to spec + remove roof rack + plan routes); 3) log results for 2 weeks; 4) test one more change if needed; 5) compare to baseline and keep the changes that yield real gains; 6) build a simple dashboard (apps or a notebook) to track MPG, hours on the road, and cost per mile.

[MichaelOM]

What’s your SUV model, typical load, and whether you’re urban-only or rural mix? If you share rough numbers, I’ll tailor a mini-plan with recommended PSI targets, a simple route-planning checklist, and a one-page before/after tracking sheet.