As an Amazon Associate I earn from qualifying purchases.
EPA sticker numbers and real-world R107 MPG diverge with tune, tires, speed, and how hard you enjoy a V8. Tank size sets range math.
Related: engine and ownership cost posts.
EPA vs real
Expect thirst on many V8s versus optimistic memories. Short trips and rich-running CIS cars look worse. Highway manners differ from city.
Tank and range
Use your tank capacity and observed MPG for trip planning. Carry a margin; running out is harder on these cars than on modern low-fuel nannies.
Common mistakes
Skipping cold and hot tests, trusting verbal history without invoices, replacing parts before measuring, and ignoring rust while chasing mechanical gremlins. Photos from another market or year are not a parts catalog.
When to stop DIY
Stop when you lack the gauge, puller, or safe support the job needs — or when the first repair did not change the symptom. Pay for diagnosis with someone who sees R107s regularly.
Practical takeaway
Fix fueling faults before blaming “all R107s drink.”
Shop notes and paperwork
Keep invoices, pressure readings, part numbers, and dated photos of the area before and after work. The next owner — or future you — will ask what was actually done. Verbal “we took care of it” evaporates at sale time.
Safety and scope
Use jack stands on solid ground, relieve fuel/coolant pressure before opening systems, and disconnect the battery when the procedure calls for it. If a step needs a specialty tool you do not own, rent it or hire it — improvising with the wrong lever is how fasteners and fingers break.
Verify against the factory manual for your engine and chassis. No invented personal car details here — use your plates, invoices, and measured symptoms.
Shop notes and paperwork
Safety and scope
If this topic intersects fuel, rust, or safety systems, fix the safety and leak paths before cosmetic or convenience items. That order saves money twice.
