2008 V8 BAD Gas mileage - Club Touareg Forums
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post #1 of 27 Old 05-06-2015 Thread Starter
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2008 V8 BAD Gas mileage

I bought a 2008 V8 I am avg 12 miles a gallon which seems low a lot of other V8 owners are claiming 14-18 MPG. I run 91 octane and have dual exhaust from cat back which I thought would help? so I am wondering is it a timing belt issues? Has anyone ever put in aftermarket air intakes or ECU flashes?? I would love to know what's working for others and aftermarket companies.
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post #2 of 27 Old 05-06-2015
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Do you do a lot of short trips?

How many miles on the engine?

What is the maintenance history?

You sort of just said Hi, it hurts, what should I do? We don't have enough info to even start guessing.
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post #3 of 27 Old 05-06-2015
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Doesn't the 2008 V8 have a timing chain?
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post #4 of 27 Old 05-06-2015
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Quote:
Originally Posted by Grambo View Post
I bought a 2008 V8 I am avg 12 miles a gallon which seems low a lot of other V8 owners are claiming 14-18 MPG. I run 91 octane and have dual exhaust from cat back which I thought would help? so I am wondering is it a timing belt issues? Has anyone ever put in aftermarket air intakes or ECU flashes?? I would love to know what's working for others and aftermarket companies.
I have the same problem... I've been driving very economically in my 2008 V6, but I'm only getting 13 mpg. It's only Wednesday and I have to fill up again after filling up Sunday night. Very frustrated
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post #5 of 27 Old 05-06-2015
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1 am around 10 in city with my AXQ engine, where 10 miles roundtrip around 30mph average speed. On highway i get around 16-18 and i always use premium gas
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post #6 of 27 Old 05-06-2015
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I have averaged 16.4 MPG over the life of my 2008 V8 with mixed 50/50 driving,
.

.
----------------------------
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post #7 of 27 Old 05-06-2015
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I have averaged 16.4 MPG over the life of my 2008 V8 with mixed 50/50 driving,
.
16.7 here with normal 60/40 city/highway driving

2008 Touareg V8
2006 6.0 F350 KR
2001 7.3 F350 ZF6 DP-Tunes
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post #8 of 27 Old 05-06-2015
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If we had a vcds scan, we could look for errors.

12 seems low. Usually can get 13 to 14 without much trouble, unless the motor never gets up to operating temp.

Dirty air filter, old spark plugs, ever had coils replaced? Tried gas from at least two different brand/locations? Any scan errors relating to the 02 sensors? The list could go on and on.

We need more info.
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post #9 of 27 Old 05-06-2015
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Quote:
Originally Posted by noobytoogy View Post
Doesn't the 2008 V8 have a timing chain?
Timing belt from 2003 to 2007 on the non facelift models. Canbus 1.6. The belt driven VW 4.2 V8 has a engine code of AXQ.

Starting with the facelift models, the V8 went to timing chain. The later VW 4.2 V8 (engine code BAR) is chain driven.
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post #10 of 27 Old 05-06-2015
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2008 V8 here and about 12-13mpg city and 16-18mpg on highway.... normal for a heavy vehicle. 93 premium gas here only

2008 4.2L FSI, Alaska Grey with Teak interior, Air Suspension, Added rear heated seats, Heated Steering Wheel, RNS510 Retrofit, Rear view camera and parking sensors, Adaptive Cruiser Control with Front Assist Retrofit, Side Assist/Lane Change Retrofit, OEM Tow package, 35% Llumar matching tint, 20" Carrera Wheels, 275/45/20XL tires. VAG Com by Ross-Tech, Yellow Porsche F/R Sway Bars, R50 front valance
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