lincslass61

i brought my astra twin top 2008,33,000 on the clock back in may. i only do short journeys a 16 mile round trip into town once or twice a week. the mpg then was 25/26. recently i noticed it was only doing 20/21 mpg for the same journey. on doing my regular oil check i noticed the oil was showing to far up the dipstick. i took it in a vauxhall garage who said the oil level was normal on the dip stick and i was probably just catching the tube when i was taking the dip stick in and out. even though i told them i have checked it regular and this had just started happening. but i guess they know better than me. but i am concerned at the mpg i'm getting now . is this normal for a twintop its a 1800 engine auto. and would getting the engine tuned make any difference.