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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old July 23rd, 2015, 08:42   #1
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Wankel7's Avatar
Join Date: Dec 2012
Location: Indiana
Question Unexpected bump in mileage?

I haven't changed my driving style or anything on the car... just fuel.

I filled up with some premium diesel....they claim 50 cetane when I called them. I took a 275 mile trip and observed normal mileage. Mainly 60 to 70mph with two people using the AC. I hand calculated 47.5mpg.

I topped it off again and just put on over 650 miles. I haven't filled up yet but SG says I am averaging 57.5. I thought it might be SG having issues but I have never gotten more than 500 miles as the needle hit 1/2 tank. This time it was 570 miles.

Could a higher cetane cause this big of a bump?
2003 Jetta Wagon 5 speed
DLC520, Audi Avant Rear Wiper, .658 5th gear, FX-R HID Retrofit, Philips DRL9 , Atlas skid plate, trailer hitch, ventectomy, Half FIS Euro Cluster, Frostheater, ceramic tint, Scangauge II, and EGR deleted.
VCDS -HEX/CAN & VagTacho available

Last edited by Wankel7; July 23rd, 2015 at 08:48.
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Old July 23rd, 2015, 15:14   #2
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Join Date: Feb 2014
Location: Iowa
Fuel Economy: Mid 40s

Ive seen 4-5mpg increase from switching fuels before.
2015 Golf SEL. Malone DSG Tune. H6 AGM East Penn Battery. Frost Heater. Ares Skid Plate. Fumoto Valve. PentoIII.
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